diff --git a/pm4py/objects/ocel/exporter/jsonocel/variants/__init__.py b/pm4py/objects/ocel/exporter/jsonocel/variants/__init__.py
index a494ca746..2faad86ce 100644
--- a/pm4py/objects/ocel/exporter/jsonocel/variants/__init__.py
+++ b/pm4py/objects/ocel/exporter/jsonocel/variants/__init__.py
@@ -1 +1,17 @@
+'''
+ This file is part of PM4Py (More Info: https://pm4py.fit.fraunhofer.de).
+
+ PM4Py 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.
+
+ PM4Py 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 PM4Py. If not, see .
+'''
from pm4py.objects.ocel.exporter.jsonocel.variants import classic, ocel20, ocel20_standard
diff --git a/pm4py/objects/ocel/exporter/jsonocel/variants/ocel20_standard.py b/pm4py/objects/ocel/exporter/jsonocel/variants/ocel20_standard.py
index f960b71c8..9c704d182 100644
--- a/pm4py/objects/ocel/exporter/jsonocel/variants/ocel20_standard.py
+++ b/pm4py/objects/ocel/exporter/jsonocel/variants/ocel20_standard.py
@@ -1,3 +1,19 @@
+'''
+ This file is part of PM4Py (More Info: https://pm4py.fit.fraunhofer.de).
+
+ PM4Py 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.
+
+ PM4Py 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 PM4Py. If not, see .
+'''
from pm4py.objects.ocel.exporter.jsonocel.variants import ocel20
from pm4py.objects.ocel.obj import OCEL
from typing import Optional, Dict, Any
diff --git a/pm4py/objects/ocel/importer/jsonocel/variants/__init__.py b/pm4py/objects/ocel/importer/jsonocel/variants/__init__.py
index d0cdbf912..a7a3d9d1f 100644
--- a/pm4py/objects/ocel/importer/jsonocel/variants/__init__.py
+++ b/pm4py/objects/ocel/importer/jsonocel/variants/__init__.py
@@ -1 +1,17 @@
+'''
+ This file is part of PM4Py (More Info: https://pm4py.fit.fraunhofer.de).
+
+ PM4Py 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.
+
+ PM4Py 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 PM4Py. If not, see .
+'''
from pm4py.objects.ocel.importer.jsonocel.variants import classic, ocel20_standard
diff --git a/pm4py/objects/ocel/importer/jsonocel/variants/ocel20_standard.py b/pm4py/objects/ocel/importer/jsonocel/variants/ocel20_standard.py
index cdccbcbf1..6bad9996a 100644
--- a/pm4py/objects/ocel/importer/jsonocel/variants/ocel20_standard.py
+++ b/pm4py/objects/ocel/importer/jsonocel/variants/ocel20_standard.py
@@ -1,3 +1,19 @@
+'''
+ This file is part of PM4Py (More Info: https://pm4py.fit.fraunhofer.de).
+
+ PM4Py 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.
+
+ PM4Py 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 PM4Py. If not, see .
+'''
from pm4py.util import exec_utils
from pm4py.objects.ocel.obj import OCEL
from typing import Optional, Dict, Any