diff --git a/.copyright.tmpl b/.copyright.tmpl
new file mode 100644
index 0000000..dec6612
--- /dev/null
+++ b/.copyright.tmpl
@@ -0,0 +1,17 @@
+Copyright (c) ${years} Maxim Slipenko, Eugene Lazurenko.
+
+This file is part of Statapp
+(see https://github.com/shizand/statapp).
+
+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/>.
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index fd16ba2..06b30e3 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -8,3 +8,9 @@ repos:
     -   id: end-of-file-fixer
     -   id: check-yaml
     -   id: check-added-large-files
+-   repo: https://github.com/johann-petrak/licenseheaders.git
+    rev: v0.8.8
+    hooks:
+    -   id: licenseheaders
+        args: ["-t", ".copyright.tmpl", "-cy", "-f", "-d", "statapp"]
+        pass_filenames: false
diff --git a/statapp/__main__.py b/statapp/__main__.py
index 7f6ccba..476045d 100644
--- a/statapp/__main__.py
+++ b/statapp/__main__.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 import sys
 
 from PySide2 import QtCore
diff --git a/statapp/about_window.py b/statapp/about_window.py
index c4253c3..86bf76f 100644
--- a/statapp/about_window.py
+++ b/statapp/about_window.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 import sys
 from PySide2.QtGui import QMovie
 from PySide2.QtWidgets import QMainWindow
diff --git a/statapp/calculations.py b/statapp/calculations.py
index 54f1b9d..1ac339e 100644
--- a/statapp/calculations.py
+++ b/statapp/calculations.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 import numpy as np
 import pandas as pd
 
@@ -29,4 +48,4 @@ def variance_analysis(data):
 
 
 def correlation_analysis(data):
-    return pd.DataFrame(data).corr().to_numpy()
\ No newline at end of file
+    return pd.DataFrame(data).corr().to_numpy()
diff --git a/statapp/correlation_analysis.py b/statapp/correlation_analysis.py
index c252a45..fae0400 100644
--- a/statapp/correlation_analysis.py
+++ b/statapp/correlation_analysis.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 from PySide2.QtWidgets import QDialog, QHeaderView
 
 from statapp.calculations import correlation_analysis
diff --git a/statapp/generate_factor_window.py b/statapp/generate_factor_window.py
index 08dd441..3cbc6bb 100644
--- a/statapp/generate_factor_window.py
+++ b/statapp/generate_factor_window.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 from PySide2.QtCore import Slot
 from PySide2.QtWidgets import QDialog
 
diff --git a/statapp/generate_window.py b/statapp/generate_window.py
index 7785bcd..5958b0a 100644
--- a/statapp/generate_window.py
+++ b/statapp/generate_window.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 from PySide2.QtCore import Slot
 from PySide2.QtWidgets import QDialog
 
diff --git a/statapp/main_window.py b/statapp/main_window.py
index 9acd5ae..10e738f 100644
--- a/statapp/main_window.py
+++ b/statapp/main_window.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 import numpy as np
 from PySide2.QtCore import Slot, QSize
 from PySide2.QtGui import QIcon
diff --git a/statapp/models/combobox_model.py b/statapp/models/combobox_model.py
index cc33814..0d34633 100644
--- a/statapp/models/combobox_model.py
+++ b/statapp/models/combobox_model.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 from PySide2.QtCore import QAbstractListModel, Qt
 
 
diff --git a/statapp/models/correlation_analysis_model.py b/statapp/models/correlation_analysis_model.py
index 3b8403d..9b287ff 100644
--- a/statapp/models/correlation_analysis_model.py
+++ b/statapp/models/correlation_analysis_model.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 from PySide2.QtCore import QModelIndex, Qt
 
 from statapp.models.ro_table_model import ROTableModel
diff --git a/statapp/models/editable_table_model.py b/statapp/models/editable_table_model.py
index e2328e6..115fbbc 100644
--- a/statapp/models/editable_table_model.py
+++ b/statapp/models/editable_table_model.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 import numpy as np
 from PySide2.QtCore import Qt
 
diff --git a/statapp/models/fileslc_model.py b/statapp/models/fileslc_model.py
index 8a41b01..33a3c18 100644
--- a/statapp/models/fileslc_model.py
+++ b/statapp/models/fileslc_model.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 import numpy as np
 from PySide2.QtWidgets import QFileDialog, QMessageBox
 
diff --git a/statapp/models/input_values_model.py b/statapp/models/input_values_model.py
index 0d770ea..c257852 100644
--- a/statapp/models/input_values_model.py
+++ b/statapp/models/input_values_model.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 import numpy as np
 from PySide2.QtCore import Qt, QModelIndex
 
diff --git a/statapp/models/ro_table_model.py b/statapp/models/ro_table_model.py
index aad69aa..6386295 100644
--- a/statapp/models/ro_table_model.py
+++ b/statapp/models/ro_table_model.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 import PySide2
 import numpy as np
 from PySide2 import QtCore
diff --git a/statapp/models/utils.py b/statapp/models/utils.py
index 6f8b3ba..beb310b 100644
--- a/statapp/models/utils.py
+++ b/statapp/models/utils.py
@@ -1,2 +1,21 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 def yx_header(count):
     return ['Y'] + [f'X{i}' for i in range(1, count)]
diff --git a/statapp/models/variance_analysis_model.py b/statapp/models/variance_analysis_model.py
index fc37522..baed769 100644
--- a/statapp/models/variance_analysis_model.py
+++ b/statapp/models/variance_analysis_model.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 from PySide2.QtCore import QModelIndex
 
 from statapp.models.ro_table_model import ROTableModel
diff --git a/statapp/ui/ui_about_window.py b/statapp/ui/ui_about_window.py
index 2bafd32..8092997 100644
--- a/statapp/ui/ui_about_window.py
+++ b/statapp/ui/ui_about_window.py
@@ -1,4 +1,24 @@
 # -*- coding: utf-8 -*-
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
+
 
 ################################################################################
 ## Form generated from reading UI file 'about_window.ui'
diff --git a/statapp/ui/ui_correlation_analysis_window.py b/statapp/ui/ui_correlation_analysis_window.py
index b71840a..a0e0528 100644
--- a/statapp/ui/ui_correlation_analysis_window.py
+++ b/statapp/ui/ui_correlation_analysis_window.py
@@ -1,4 +1,24 @@
 # -*- coding: utf-8 -*-
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
+
 
 ################################################################################
 ## Form generated from reading UI file 'correlation_analysis_window.ui'
@@ -39,4 +59,3 @@ class Ui_CorrelationAnalysisWindow(object):
     def retranslateUi(self, CorrelationAnalysisWindow):
         CorrelationAnalysisWindow.setWindowTitle(QCoreApplication.translate("CorrelationAnalysisWindow", u"\u041a\u043e\u0440\u0440\u0435\u043b\u044f\u0446\u0438\u043e\u043d\u043d\u044b\u0439 \u0430\u043d\u0430\u043b\u0438\u0437", None))
     # retranslateUi
-
diff --git a/statapp/ui/ui_generate_factor_window.py b/statapp/ui/ui_generate_factor_window.py
index 01c3cb1..727b1b7 100644
--- a/statapp/ui/ui_generate_factor_window.py
+++ b/statapp/ui/ui_generate_factor_window.py
@@ -1,4 +1,24 @@
 # -*- coding: utf-8 -*-
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
+
 
 ################################################################################
 ## Form generated from reading UI file 'generate_factor_window.ui'
diff --git a/statapp/ui/ui_generate_window.py b/statapp/ui/ui_generate_window.py
index e3c8628..c3fbe49 100644
--- a/statapp/ui/ui_generate_window.py
+++ b/statapp/ui/ui_generate_window.py
@@ -1,4 +1,24 @@
 # -*- coding: utf-8 -*-
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
+
 
 ################################################################################
 ## Form generated from reading UI file 'generate_window.ui'
diff --git a/statapp/ui/ui_main_window.py b/statapp/ui/ui_main_window.py
index 2759c89..89f3292 100644
--- a/statapp/ui/ui_main_window.py
+++ b/statapp/ui/ui_main_window.py
@@ -1,4 +1,24 @@
 # -*- coding: utf-8 -*-
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
+
 
 ################################################################################
 ## Form generated from reading UI file 'main_window.ui'
@@ -105,4 +125,3 @@ class Ui_MainWindow(object):
         self.modelmenu.setTitle(QCoreApplication.translate("MainWindow", u"\u041c\u043e\u0434\u0435\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435", None))
         self.helpmenu.setTitle(QCoreApplication.translate("MainWindow", u"\u0421\u043f\u0440\u0430\u0432\u043a\u0430", None))
     # retranslateUi
-
diff --git a/statapp/ui/ui_variance_analysis_window.py b/statapp/ui/ui_variance_analysis_window.py
index 07988a2..80dd0b6 100644
--- a/statapp/ui/ui_variance_analysis_window.py
+++ b/statapp/ui/ui_variance_analysis_window.py
@@ -1,4 +1,24 @@
 # -*- coding: utf-8 -*-
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
+
 
 ################################################################################
 ## Form generated from reading UI file 'variance_analysis_window.ui'
@@ -39,4 +59,3 @@ class Ui_VarianceAnalysisWindow(object):
     def retranslateUi(self, VarianceAnalysisWindow):
         VarianceAnalysisWindow.setWindowTitle(QCoreApplication.translate("VarianceAnalysisWindow", u"\u0414\u0438\u0441\u043f\u0435\u0440\u0441\u0438\u043e\u043d\u043d\u044b\u0439 \u0430\u043d\u0430\u043b\u0438\u0437", None))
     # retranslateUi
-
diff --git a/statapp/utils.py b/statapp/utils.py
index 9dbc210..7a90aa5 100644
--- a/statapp/utils.py
+++ b/statapp/utils.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 import os
 import sys
 
diff --git a/statapp/variance_analysis.py b/statapp/variance_analysis.py
index df8476a..dc6adf6 100644
--- a/statapp/variance_analysis.py
+++ b/statapp/variance_analysis.py
@@ -1,3 +1,22 @@
+#
+# Copyright (c) 2023 Maxim Slipenko, Eugene Lazurenko.
+#
+# This file is part of Statapp
+# (see https://github.com/shizand/statapp).
+#
+# 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/>.
+#
 from PySide2.QtWidgets import QDialog, QHeaderView
 
 from statapp.calculations import variance_analysis