diff --git a/bin/silkaj b/bin/silkaj
index 542ff7fb85067ce74b4d21f0c8108490055570be..ad32119eb80b5aa97412f9caaa6ea4734fa24356 100755
--- a/bin/silkaj
+++ b/bin/silkaj
@@ -1,5 +1,22 @@
 #!/usr/bin/env python3
 
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 from sys import exit
 
 from silkaj.cli_tools import manage_cmd
diff --git a/silkaj/__init__.py b/silkaj/__init__.py
index 775d1576f8ea4c5ea3ed9820688908fc98e61d45..4a5c4f335e52065aeb987eceb717dc24989d726a 100644
--- a/silkaj/__init__.py
+++ b/silkaj/__init__.py
@@ -1 +1,18 @@
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 name = "silkaj"
diff --git a/silkaj/auth.py b/silkaj/auth.py
index e9c336f133dce43d4249156bfcd5be7f8fbe7b02..3025265a402cb0adab9334ba5a522ad89456d129 100644
--- a/silkaj/auth.py
+++ b/silkaj/auth.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 from silkaj.crypto_tools import get_publickey_from_seed, b58_decode, xor_bytes
 from silkaj.tools import message_exit
 from nacl import encoding
diff --git a/silkaj/blockchain_tools.py b/silkaj/blockchain_tools.py
index 3698bd3dccf1ac2b59e57ab1d7f466af7103c8a3..fb7ad8cb6c019beb176296575d1c2e3343fcde53 100644
--- a/silkaj/blockchain_tools.py
+++ b/silkaj/blockchain_tools.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 from silkaj.network_tools import get_request
 
 
diff --git a/silkaj/cert.py b/silkaj/cert.py
index f821cc1f4dc3f104fe4b04da2bd1145dc00cdac9..c2ae84ebafec0751dab57cc07b632fea5fcf5381 100644
--- a/silkaj/cert.py
+++ b/silkaj/cert.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 import urllib
 from time import time
 from tabulate import tabulate
diff --git a/silkaj/cli_tools.py b/silkaj/cli_tools.py
index e2e7d9c7bce14fae320f2871d5da0adb2e244fce..4633ef233a4791f8bc208ed8b50c63be2fb419d4 100644
--- a/silkaj/cli_tools.py
+++ b/silkaj/cli_tools.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 # -*- coding: utf-8 -*-
 
 import click
@@ -42,8 +59,7 @@ from silkaj.constants import (
     "--auth-scrypt", is_flag=True, help="Scrypt authentication: default method"
 )
 @click.option(
-    "--nrp",
-    help="Scrypt parameters seperated by commas: defaults N,r,p: 4096,16,1",
+    "--nrp", help="Scrypt parameters seperated by commas: defaults N,r,p: 4096,16,1"
 )
 @click.option(
     "--auth-file", is_flag=True, help="Authentication file. Defaults to: './authfile'"
@@ -52,9 +68,7 @@ from silkaj.constants import (
 @click.option("--auth-seed", is_flag=True, help="Seed authentication")
 @click.option("--auth-wif", is_flag=True, help="WIF and EWIF authentication methods")
 @click.pass_context
-def cli(
-    ctx, peer, gtest, auth_scrypt, nrp, auth_file, file, auth_seed, auth_wif
-):
+def cli(ctx, peer, gtest, auth_scrypt, nrp, auth_file, file, auth_seed, auth_wif):
     ctx.obj = dict()
     ctx.ensure_object(dict)
     ctx.obj["PEER"] = peer
@@ -89,9 +103,7 @@ def cliArgos():
     argos_info()
 
 
-@cli.command(
-    "authfile", help="Generate file to store the seed of the account"
-)
+@cli.command("authfile", help="Generate file to store the seed of the account")
 @click.option("--file", help="Path file")
 def cliGenerateAuthFile(file):
     generate_auth_file(file)
diff --git a/silkaj/commands.py b/silkaj/commands.py
index 89c9499aa2f165786e7ad1cd5244852121e1586e..ed985d758ad2c79cff6335eb5c91ad341d37462d 100644
--- a/silkaj/commands.py
+++ b/silkaj/commands.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 from datetime import datetime
 from time import sleep
 from os import system, popen
diff --git a/silkaj/constants.py b/silkaj/constants.py
index 9f61e5b0795b85b17e2cdb5ef9e97522cbc0b474..3a879f3813288c3bcb81f7eb044424d1b14d041d 100644
--- a/silkaj/constants.py
+++ b/silkaj/constants.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 SILKAJ_VERSION = "0.6.4"
 NO_MATCHING_ID = "No matching identity"
 G1_SYMBOL = "Äž1"
diff --git a/silkaj/crypto_tools.py b/silkaj/crypto_tools.py
index d9dad99134e7019dda64c2948096c0b44f466486..2951d94019aaaec12bfe2277c852952b718a9cb0 100644
--- a/silkaj/crypto_tools.py
+++ b/silkaj/crypto_tools.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 from nacl import encoding, signing, hash, bindings
 from re import compile, search
 
diff --git a/silkaj/license.py b/silkaj/license.py
index cb0a19e792c97bfe4f7c56eec40cf84d3f00168f..55467fd85e930861a61816e4ac260b21fdb2c0ae 100644
--- a/silkaj/license.py
+++ b/silkaj/license.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 import webbrowser
 from pydoc import pager
 from sys import exit
diff --git a/silkaj/money.py b/silkaj/money.py
index 87cff6021753d6890ff61125965297e191593b46..c6b9342461c3e12ec92ce1942425eaab90828a39 100644
--- a/silkaj/money.py
+++ b/silkaj/money.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 import click
 from silkaj.network_tools import get_request, HeadBlock
 from silkaj.crypto_tools import get_publickey_from_seed
diff --git a/silkaj/network_tools.py b/silkaj/network_tools.py
index 85e9860601c85054d8cd63dbc033e74c1ac58d64..8784fd13ae7758bbdf758b0210834beb7950a67f 100644
--- a/silkaj/network_tools.py
+++ b/silkaj/network_tools.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 from __future__ import unicode_literals
 from ipaddress import ip_address
 from json import loads
diff --git a/silkaj/tools.py b/silkaj/tools.py
index cf5f700a76d75bee0d81603c1ce89a0355069941..aa7355de79c845355dfc120383e6e2696b82ed3c 100644
--- a/silkaj/tools.py
+++ b/silkaj/tools.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 from datetime import datetime
 from sys import exit
 
diff --git a/silkaj/tx.py b/silkaj/tx.py
index 89bc50b7fdf7e4ae01cea24eb63badb77e7e2207..0e37d6f3d470273f328273da97783c781d35c73f 100644
--- a/silkaj/tx.py
+++ b/silkaj/tx.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 from re import compile, search
 import math
 from time import sleep
diff --git a/silkaj/wot.py b/silkaj/wot.py
index db926b3bf421a56771caed93b96234e84cc8565b..4d1b25e8efbee0611897f4e6be6a4538447892d2 100644
--- a/silkaj/wot.py
+++ b/silkaj/wot.py
@@ -1,3 +1,20 @@
+"""
+Copyright  2016-2019 Maël Azimi <m.a@moul.re>
+
+Silkaj is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Silkaj 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 from time import time
 from tabulate import tabulate
 from collections import OrderedDict