diff --git a/duniterpy/__init__.py b/duniterpy/__init__.py
index 9931ea2dea0c07beecad6d8edbeda76514f190aa..b2c33d257f21199f912982a46fea7f3be783250a 100644
--- a/duniterpy/__init__.py
+++ b/duniterpy/__init__.py
@@ -1,21 +1,19 @@
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-# Authors:
-# Caner Candan <caner@candan.fr>, http://caner.candan.fr
-#
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
 
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
 
 __author__ = "Caner Candan & inso & vit"
 __version__ = "0.58.0"
diff --git a/duniterpy/api/bma/__init__.py b/duniterpy/api/bma/__init__.py
index 9857ef0eaa3160974177683e79c241f3a11a82f9..962789ffe33af930c03241faa1833fbaff28bc98 100644
--- a/duniterpy/api/bma/__init__.py
+++ b/duniterpy/api/bma/__init__.py
@@ -1,20 +1,20 @@
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-# Authors:
-# Caner Candan <caner@candan.fr>, http://caner.candan.fr
-# Inso <insomniak.fr at gmail.com>
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import logging
 from . import network, blockchain, tx, wot, node, ud, ws
 
diff --git a/duniterpy/api/bma/blockchain.py b/duniterpy/api/bma/blockchain.py
index 4203401a28708988c6ff05f2ad0917dddc7fa7e4..2705b7d9ea5edb047375eb545e2155db058ab38c 100644
--- a/duniterpy/api/bma/blockchain.py
+++ b/duniterpy/api/bma/blockchain.py
@@ -1,20 +1,20 @@
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-# Authors:
-# Caner Candan <caner@candan.fr>, http://caner.candan.fr
-# vit
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import logging
 from typing import Union
 
diff --git a/duniterpy/api/bma/network.py b/duniterpy/api/bma/network.py
index bdf54d84b717e2fbdcd2756490040acbc275912a..1db715f7c28c1d1d8eda6ae68c8531642bc1d158 100644
--- a/duniterpy/api/bma/network.py
+++ b/duniterpy/api/bma/network.py
@@ -1,20 +1,20 @@
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-# Authors:
-# Caner Candan <caner@candan.fr>, http://caner.candan.fr
-# vit
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import logging
 
 from aiohttp import ClientResponse
diff --git a/duniterpy/api/bma/node.py b/duniterpy/api/bma/node.py
index 95d45dd2f36e52aef9cc7d47b64900b1eda82520..08dee7561ffbce9c511e2a6d68bd4bac9bfe578c 100644
--- a/duniterpy/api/bma/node.py
+++ b/duniterpy/api/bma/node.py
@@ -1,20 +1,20 @@
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-# Authors:
-# Caner Candan <caner@candan.fr>, http://caner.candan.fr
-# vit
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import logging
 
 from duniterpy.api.client import Client
diff --git a/duniterpy/api/bma/tx.py b/duniterpy/api/bma/tx.py
index 9bb4db60e43c32a36e51eeef122aee476dad8ffc..d4e5c03ff9336d707288fffbd07c910173252c86 100644
--- a/duniterpy/api/bma/tx.py
+++ b/duniterpy/api/bma/tx.py
@@ -1,20 +1,20 @@
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-# Authors:
-# Caner Candan <caner@candan.fr>, http://caner.candan.fr
-# vit
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import logging
 
 from aiohttp import ClientResponse
diff --git a/duniterpy/api/bma/ud.py b/duniterpy/api/bma/ud.py
index 4b2653cb25b2534b78ab38fa80e11dab6f16fccf..189b3cf392d479567e3afe231c8d2098f9d5e591 100644
--- a/duniterpy/api/bma/ud.py
+++ b/duniterpy/api/bma/ud.py
@@ -1,20 +1,20 @@
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-# Authors:
-# Caner Candan <caner@candan.fr>, http://caner.candan.fr
-# vit
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import logging
 
 from duniterpy.api.client import Client
diff --git a/duniterpy/api/bma/wot.py b/duniterpy/api/bma/wot.py
index cc08973270d398f813f38852901f32f00d0ce44b..733b14b7578d5388182ce378ff21bfeb88b99e2c 100644
--- a/duniterpy/api/bma/wot.py
+++ b/duniterpy/api/bma/wot.py
@@ -1,20 +1,20 @@
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-# Authors:
-# Caner Candan <caner@candan.fr>, http://caner.candan.fr
-# vit
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import logging
 
 from aiohttp import ClientResponse
diff --git a/duniterpy/api/bma/ws.py b/duniterpy/api/bma/ws.py
index e4e1d021aff6e2a41661a2c0f0e8dcad8fca4671..76d87cfe82dae6311b1aef0c63a67e4903da01b2 100644
--- a/duniterpy/api/bma/ws.py
+++ b/duniterpy/api/bma/ws.py
@@ -1,21 +1,20 @@
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-# Authors:
-# Caner Candan <caner@candan.fr>, http://caner.candan.fr
-#
-# vit
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import logging
 
 from duniterpy.api.bma.blockchain import BLOCK_SCHEMA
diff --git a/duniterpy/api/client.py b/duniterpy/api/client.py
index d41c2f0de0e8bf1f03774c5754406a968161d9ba..23a3dc176a79cc325da4f585f6facaaa93478025 100644
--- a/duniterpy/api/client.py
+++ b/duniterpy/api/client.py
@@ -1,7 +1,20 @@
-# Authors:
-# Caner Candan <caner@candan.fr>, http://caner.candan.fr
-# Inso <insomniak.fr at gmail.com>
-# vit
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import json
 import logging
 from typing import Callable, Union, Any, Optional
diff --git a/duniterpy/api/endpoint.py b/duniterpy/api/endpoint.py
index e171f27a6b1aa09ef4cc2e931c60b793f654e45c..cde3647eb15c3434d94448213d36dd09c88f9c13 100644
--- a/duniterpy/api/endpoint.py
+++ b/duniterpy/api/endpoint.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import re
 from typing import Any, Optional, TypeVar, Type, Dict
 
diff --git a/duniterpy/api/errors.py b/duniterpy/api/errors.py
index 5875cfbb32a1b8a83b02e29a57b0bb27504ed818..45c794bf191ff9dd23df11fc013c024cc4ebc368 100644
--- a/duniterpy/api/errors.py
+++ b/duniterpy/api/errors.py
@@ -1,3 +1,21 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+
 class DuniterError(Exception):
     """
     Handle duniter error
diff --git a/duniterpy/api/ws2p/__init__.py b/duniterpy/api/ws2p/__init__.py
index 09c79049209da90a8a0199f954c6c32c06d6ff46..0590ff8db6f197394c5d43423835804db7d052c6 100644
--- a/duniterpy/api/ws2p/__init__.py
+++ b/duniterpy/api/ws2p/__init__.py
@@ -1,20 +1,20 @@
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-# Authors:
-# Caner Candan <caner@candan.fr>, http://caner.candan.fr
-# Inso <insomniak.fr at gmail.com>
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import logging
 from . import network, requests
 
diff --git a/duniterpy/api/ws2p/network.py b/duniterpy/api/ws2p/network.py
index d560573037a8a6a56aef70aaf6f34746dc695bf1..db9e86062567fb01408e1566d864d1f50d0de671 100644
--- a/duniterpy/api/ws2p/network.py
+++ b/duniterpy/api/ws2p/network.py
@@ -1,20 +1,20 @@
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-# Authors:
-# Caner Candan <caner@candan.fr>, http://caner.candan.fr
-# vit
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import logging
 
 from duniterpy.api.client import Client
diff --git a/duniterpy/api/ws2p/requests.py b/duniterpy/api/ws2p/requests.py
index ab8269411bf3b94736133b2601613e7698b3f0db..cc96871864d549eeab47767da706dd9242b65fc3 100644
--- a/duniterpy/api/ws2p/requests.py
+++ b/duniterpy/api/ws2p/requests.py
@@ -1,12 +1,14 @@
 """
-This program is free software: you can redistribute it and/or modify
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
-This program is distributed in the hope that it will be useful,
+DuniterPy is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
diff --git a/duniterpy/constants.py b/duniterpy/constants.py
index 626f338238a3340bde5678c8520540420c8894f4..494d79002680c17107d1c5bd405c37e490f1aef3 100644
--- a/duniterpy/constants.py
+++ b/duniterpy/constants.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 UID_REGEX = "[A-Za-z0-9_-]{2,100}"
 PUBKEY_REGEX = "(?![OIl])[1-9A-Za-z]{42,45}"
 SIGNATURE_REGEX = "[A-Za-z0-9+/]+(?:=|==)?"
diff --git a/duniterpy/documents/__init__.py b/duniterpy/documents/__init__.py
index 25d684d739309089cc6571b8fb26d34cfaa7debe..87c10480d0310acc0cb4693a0402750778079018 100644
--- a/duniterpy/documents/__init__.py
+++ b/duniterpy/documents/__init__.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 from .block import Block
 from .block_uid import BlockUID, block_uid
 from .document import Document, MalformedDocumentError
diff --git a/duniterpy/documents/block.py b/duniterpy/documents/block.py
index 087cbc07473548e363a1ecb11dd440d104996a37..16e044a793317e7bf960acc7cc3d1289f331e016 100644
--- a/duniterpy/documents/block.py
+++ b/duniterpy/documents/block.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import base64
 import hashlib
 import re
diff --git a/duniterpy/documents/block_uid.py b/duniterpy/documents/block_uid.py
index 03509a1abaa041f632995ce8f909bf1a24fd24ee..5cffd3b6114593eca8878de79e0767f94555e662 100644
--- a/duniterpy/documents/block_uid.py
+++ b/duniterpy/documents/block_uid.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import re
 from typing import Union, TypeVar, Type
 
diff --git a/duniterpy/documents/certification.py b/duniterpy/documents/certification.py
index b5cdfd36a33691cfd089cf29d945badc993e5ae2..d551cc14142aab49c86ee7825da5c28a835b3bd3 100644
--- a/duniterpy/documents/certification.py
+++ b/duniterpy/documents/certification.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import base64
 import logging
 import re
diff --git a/duniterpy/documents/crc_pubkey.py b/duniterpy/documents/crc_pubkey.py
index e9d55cd77e24eb9d6d1d2fe9a6ecef3f3b2a6574..b5acc03e8a2a6aad8cc6da3d6a0fb645ffad2e3c 100644
--- a/duniterpy/documents/crc_pubkey.py
+++ b/duniterpy/documents/crc_pubkey.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 from typing import TypeVar, Type
 
 import base58
diff --git a/duniterpy/documents/document.py b/duniterpy/documents/document.py
index 05d19162df3d914684598303ee56b0da0529c6dc..06f779a45f62839f6d2007ad9081f042be01f75a 100644
--- a/duniterpy/documents/document.py
+++ b/duniterpy/documents/document.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import base64
 import hashlib
 import logging
diff --git a/duniterpy/documents/identity.py b/duniterpy/documents/identity.py
index a3a95cd8ce84dc7f7853ec65000d3cf4d8229e11..58a19a1ed889adfd296d38881bb82efd56f4ac80 100644
--- a/duniterpy/documents/identity.py
+++ b/duniterpy/documents/identity.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import re
 from typing import Optional, TypeVar, Type
 
diff --git a/duniterpy/documents/membership.py b/duniterpy/documents/membership.py
index 632a02216270e0057525714dabfb0ed1a6e361c4..bf8a6df953d30ec56739cdcff5a107b35ba045b4 100644
--- a/duniterpy/documents/membership.py
+++ b/duniterpy/documents/membership.py
@@ -1,8 +1,20 @@
 """
-Created on 2 déc. 2014
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
 
-@author: inso
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
+
 import re
 from typing import TypeVar, Type, Optional
 
diff --git a/duniterpy/documents/peer.py b/duniterpy/documents/peer.py
index 78e5857337079d9e1556d86b71975ff969892b64..a117fd41e7eb9547c5732b4f1dd06d36aeeec872 100644
--- a/duniterpy/documents/peer.py
+++ b/duniterpy/documents/peer.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import re
 from typing import TypeVar, List, Type
 
diff --git a/duniterpy/documents/revocation.py b/duniterpy/documents/revocation.py
index 8292e8d2f4256dcbce863145327b54f68f8318d3..990535e5f76728d100231f3731d90e3d4786c326 100644
--- a/duniterpy/documents/revocation.py
+++ b/duniterpy/documents/revocation.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import base64
 import re
 from typing import Union, Type, TypeVar
diff --git a/duniterpy/documents/transaction.py b/duniterpy/documents/transaction.py
index f0f6447ea6da002e7ddfa604ee5d14893cbc7e7a..ec66cdaf433921f86d0a45a05d717fdccf46d7ab 100644
--- a/duniterpy/documents/transaction.py
+++ b/duniterpy/documents/transaction.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import re
 from typing import TypeVar, List, Any, Type, Optional, Dict, Union, Tuple
 
diff --git a/duniterpy/documents/ws2p/heads.py b/duniterpy/documents/ws2p/heads.py
index 521811529e07cf146662d6120b307ee277b17f62..19c972ade7cb397458615e9309f1ae21de1dddbd 100644
--- a/duniterpy/documents/ws2p/heads.py
+++ b/duniterpy/documents/ws2p/heads.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import re
 import attr
 
diff --git a/duniterpy/documents/ws2p/messages.py b/duniterpy/documents/ws2p/messages.py
index 3842ca6abe4b4bbc2f276d02d17466d5f67533a9..7cf02cf741c28f0f9a2d3df7dd7273ddd734df62 100644
--- a/duniterpy/documents/ws2p/messages.py
+++ b/duniterpy/documents/ws2p/messages.py
@@ -1,12 +1,14 @@
 """
-This program is free software: you can redistribute it and/or modify
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
-This program is distributed in the hope that it will be useful,
+DuniterPy is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
diff --git a/duniterpy/grammars/output.py b/duniterpy/grammars/output.py
index cf2f34f571e931b0548f58e3405c1a270e4ed55b..a6ec16cbfe88e6b4184a50007184bb4468b5c800 100644
--- a/duniterpy/grammars/output.py
+++ b/duniterpy/grammars/output.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 from typing import Optional, TypeVar, Type, Any, Union
 
 from pypeg2 import re, attr, Keyword, Enum, contiguous, maybe_some, whitespace, K
diff --git a/duniterpy/helpers/money.py b/duniterpy/helpers/money.py
index 0a9d0729643b65d3efe52b19e947fb116348cd1d..adca356e1b16781d708257eb3ff0997fb767f742 100644
--- a/duniterpy/helpers/money.py
+++ b/duniterpy/helpers/money.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 from typing import Union, Any
 from duniterpy.grammars.output import SIG, CSV, CLTV, XHX, Condition
 
diff --git a/duniterpy/helpers/ws2p.py b/duniterpy/helpers/ws2p.py
index 0969056751a6cb0e7c057cf113240a88743086a0..c43f688b3bffbebab18fc1a138bd24f897c2f4c4 100644
--- a/duniterpy/helpers/ws2p.py
+++ b/duniterpy/helpers/ws2p.py
@@ -1,12 +1,14 @@
 """
-This program is free software: you can redistribute it and/or modify
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
-This program is distributed in the hope that it will be useful,
+DuniterPy is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
diff --git a/duniterpy/key/__init__.py b/duniterpy/key/__init__.py
index cbdf37b8f79af8d5275e3ef664f4814eed83bd72..a116898c4a5c3b9f74a516871f46a2d2bde59402 100644
--- a/duniterpy/key/__init__.py
+++ b/duniterpy/key/__init__.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 from .signing_key import SigningKey
 from .verifying_key import VerifyingKey
 from .encryption_key import SecretKey, PublicKey
diff --git a/duniterpy/key/ascii_armor.py b/duniterpy/key/ascii_armor.py
index 77b87242252e9916806629eef5d90941ae1ff59d..122497ef7beca2eeb456d3131903b2d05b75ed8d 100644
--- a/duniterpy/key/ascii_armor.py
+++ b/duniterpy/key/ascii_armor.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import base64
 import libnacl
 import re
diff --git a/duniterpy/key/base58.py b/duniterpy/key/base58.py
index cfb8021c81a97b98639a297169620ae7f2d7e5dc..599b8738992ba8d41d5d852677e07db11da67abf 100644
--- a/duniterpy/key/base58.py
+++ b/duniterpy/key/base58.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 from typing import Union
 
 import base58
diff --git a/duniterpy/key/constants.py b/duniterpy/key/constants.py
index 9c3e3d88dbe04543c799cda87b0ed50f9e58d235..fb78cb86eb4c5f958b5025501c9dc587c517cd35 100644
--- a/duniterpy/key/constants.py
+++ b/duniterpy/key/constants.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 # Libnacl
 crypto_sign_BYTES = 64
 
diff --git a/duniterpy/key/encryption_key.py b/duniterpy/key/encryption_key.py
index 509b63f4d807436e9507bb2874a352f6615bc3f9..9129b497eb01685116cd964c656f3e9d09887cf1 100644
--- a/duniterpy/key/encryption_key.py
+++ b/duniterpy/key/encryption_key.py
@@ -1,8 +1,20 @@
 """
-duniter public and private keys
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
 
-@author: inso
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
+
 from typing import Union, Optional
 
 import libnacl.public
diff --git a/duniterpy/key/scrypt_params.py b/duniterpy/key/scrypt_params.py
index e4fb0f96e9f2e31c70b427e1453cafac4760069c..feb49eaa2d9b1bf26a673f4cc7d71d762a909df8 100644
--- a/duniterpy/key/scrypt_params.py
+++ b/duniterpy/key/scrypt_params.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 from typing import Optional
 
 from .constants import SCRYPT_PARAMS
diff --git a/duniterpy/key/signing_key.py b/duniterpy/key/signing_key.py
index 25324e74c7396b476390a5ac9438e09640b0d81f..a0a7c0c1523deede22ce34b895fdfff3a903ec5c 100644
--- a/duniterpy/key/signing_key.py
+++ b/duniterpy/key/signing_key.py
@@ -1,8 +1,20 @@
 """
-duniter public and private keys
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
 
-@author: inso, vtexier, Moul
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
+
 import base64
 import re
 from typing import Optional, Union, TypeVar, Type
diff --git a/duniterpy/key/verifying_key.py b/duniterpy/key/verifying_key.py
index 54bbae8b84a7a6bedf785c0c249d4e0f1da357e9..c227c987e98066026552d76030c3a87999fbbcc0 100644
--- a/duniterpy/key/verifying_key.py
+++ b/duniterpy/key/verifying_key.py
@@ -1,7 +1,18 @@
 """
-duniter public and private keys
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
 
-@author: inso
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
 
 import base64
diff --git a/duniterpy/tools.py b/duniterpy/tools.py
index f2bb3b2a6f24cb6bbdfcb47c217920247c5a0eba..ee25f8850e6fab7e8c94a82887adf53a194a8e1d 100644
--- a/duniterpy/tools.py
+++ b/duniterpy/tools.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2014-2020 Vincent Texier <vit@free.fr>
+
+DuniterPy is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+DuniterPy is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 import uuid
 from typing import Union
 from libnacl.encode import hex_decode, hex_encode