diff --git a/gui/codeeditor.cpp b/gui/codeeditor.cpp
index 567a12a43..fa40cbec9 100644
--- a/gui/codeeditor.cpp
+++ b/gui/codeeditor.cpp
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #include "codeeditor.h"
 
 #include <QShortcut>
diff --git a/gui/codeeditor.h b/gui/codeeditor.h
index fc0a41df6..df771cfc8 100644
--- a/gui/codeeditor.h
+++ b/gui/codeeditor.h
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #ifndef CODEEDITOR_H
 #define CODEEDITOR_H
 
diff --git a/gui/codeeditstylecontrols.h b/gui/codeeditstylecontrols.h
index ef2ded1c8..03fab0ba7 100644
--- a/gui/codeeditstylecontrols.h
+++ b/gui/codeeditstylecontrols.h
@@ -1,6 +1,6 @@
 /*
  * Cppcheck - A tool for static C/C++ code analysis
- * Copyright (C) 2007-2019 Cppcheck team.
+ * Copyright (C) 2007-2021 Cppcheck team.
  *
  * 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
diff --git a/gui/functioncontractdialog.cpp b/gui/functioncontractdialog.cpp
index 0ed7c1ad5..bc438fb16 100644
--- a/gui/functioncontractdialog.cpp
+++ b/gui/functioncontractdialog.cpp
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #include "functioncontractdialog.h"
 #include "ui_functioncontractdialog.h"
 
diff --git a/gui/functioncontractdialog.h b/gui/functioncontractdialog.h
index 4f4863041..a93d71e73 100644
--- a/gui/functioncontractdialog.h
+++ b/gui/functioncontractdialog.h
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #ifndef FUNCTIONCONTRACTDIALOG_H
 #define FUNCTIONCONTRACTDIALOG_H
 
diff --git a/gui/helpdialog.cpp b/gui/helpdialog.cpp
index 66c40a6cb..0785e2a54 100644
--- a/gui/helpdialog.cpp
+++ b/gui/helpdialog.cpp
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #include "helpdialog.h"
 #include "ui_helpdialog.h"
 #include "common.h"
diff --git a/gui/helpdialog.h b/gui/helpdialog.h
index e37784437..217497553 100644
--- a/gui/helpdialog.h
+++ b/gui/helpdialog.h
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #ifndef HELPDIALOG_H
 #define HELPDIALOG_H
 
diff --git a/gui/libraryaddfunctiondialog.cpp b/gui/libraryaddfunctiondialog.cpp
index 16440e0a4..54fa2fd7b 100644
--- a/gui/libraryaddfunctiondialog.cpp
+++ b/gui/libraryaddfunctiondialog.cpp
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #include "libraryaddfunctiondialog.h"
 #include "ui_libraryaddfunctiondialog.h"
 
diff --git a/gui/libraryaddfunctiondialog.h b/gui/libraryaddfunctiondialog.h
index 3dd81ccd5..316ac1913 100644
--- a/gui/libraryaddfunctiondialog.h
+++ b/gui/libraryaddfunctiondialog.h
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #ifndef LIBRARYADDFUNCTIONDIALOG_H
 #define LIBRARYADDFUNCTIONDIALOG_H
 
diff --git a/gui/libraryeditargdialog.cpp b/gui/libraryeditargdialog.cpp
index a874ed760..041f50f44 100644
--- a/gui/libraryeditargdialog.cpp
+++ b/gui/libraryeditargdialog.cpp
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #include "libraryeditargdialog.h"
 #include "ui_libraryeditargdialog.h"
 
diff --git a/gui/libraryeditargdialog.h b/gui/libraryeditargdialog.h
index f14317ad1..b89798f8d 100644
--- a/gui/libraryeditargdialog.h
+++ b/gui/libraryeditargdialog.h
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #ifndef LIBRARYEDITARGDIALOG_H
 #define LIBRARYEDITARGDIALOG_H
 
diff --git a/gui/newsuppressiondialog.cpp b/gui/newsuppressiondialog.cpp
index ed658cc50..28104129d 100644
--- a/gui/newsuppressiondialog.cpp
+++ b/gui/newsuppressiondialog.cpp
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #include "newsuppressiondialog.h"
 #include "ui_newsuppressiondialog.h"
 #include "cppcheck.h"
diff --git a/gui/newsuppressiondialog.h b/gui/newsuppressiondialog.h
index 442a28c6c..2d3c29b9a 100644
--- a/gui/newsuppressiondialog.h
+++ b/gui/newsuppressiondialog.h
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #ifndef NEWSUPPRESSIONDIALOG_H
 #define NEWSUPPRESSIONDIALOG_H
 
diff --git a/gui/platforms.cpp b/gui/platforms.cpp
index 1daef2bf2..36cd177f4 100644
--- a/gui/platforms.cpp
+++ b/gui/platforms.cpp
@@ -1,6 +1,6 @@
 /*
  * Cppcheck - A tool for static C/C++ code analysis
- * Copyright (C) 2007-2016 Cppcheck team.
+ * Copyright (C) 2007-2021 Cppcheck team.
  *
  * 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
diff --git a/gui/variablecontractsdialog.cpp b/gui/variablecontractsdialog.cpp
index b73465da8..e0ae1f53f 100644
--- a/gui/variablecontractsdialog.cpp
+++ b/gui/variablecontractsdialog.cpp
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #include "variablecontractsdialog.h"
 #include "ui_variablecontractsdialog.h"
 
diff --git a/gui/variablecontractsdialog.h b/gui/variablecontractsdialog.h
index aea68dc60..88bc0c3d0 100644
--- a/gui/variablecontractsdialog.h
+++ b/gui/variablecontractsdialog.h
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #ifndef VARIABLECONSTRAINTSDIALOG_H
 #define VARIABLECONSTRAINTSDIALOG_H
 
diff --git a/lib/config.h b/lib/config.h
index 3c4a4ccb3..e358da5e5 100644
--- a/lib/config.h
+++ b/lib/config.h
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #ifndef configH
 #define configH
 
diff --git a/lib/pathmatch.h b/lib/pathmatch.h
index c8cd4591b..2fe344115 100644
--- a/lib/pathmatch.h
+++ b/lib/pathmatch.h
@@ -1,6 +1,6 @@
 /*
  * Cppcheck - A tool for static C/C++ code analysis
- * Copyright (C) 2007-2018 Cppcheck team.
+ * Copyright (C) 2007-2021 Cppcheck team.
  *
  * 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
diff --git a/oss-fuzz/main.cpp b/oss-fuzz/main.cpp
index 5d6893c0c..d16f1e1e4 100644
--- a/oss-fuzz/main.cpp
+++ b/oss-fuzz/main.cpp
@@ -1,3 +1,20 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
 
 #include "color.h"
 #include "cppcheck.h"
diff --git a/tools/triage/main.cpp b/tools/triage/main.cpp
index a37d92c68..1ee5b8a0f 100644
--- a/tools/triage/main.cpp
+++ b/tools/triage/main.cpp
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #include "mainwindow.h"
 #include <QApplication>
 
diff --git a/tools/triage/mainwindow.cpp b/tools/triage/mainwindow.cpp
index 028055734..a3587b54c 100644
--- a/tools/triage/mainwindow.cpp
+++ b/tools/triage/mainwindow.cpp
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #include "mainwindow.h"
 #include "ui_mainwindow.h"
 #include <QClipboard>
diff --git a/tools/triage/mainwindow.h b/tools/triage/mainwindow.h
index 09974f8da..1e62b6129 100644
--- a/tools/triage/mainwindow.h
+++ b/tools/triage/mainwindow.h
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2021 Cppcheck team.
+ *
+ * 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/>.
+ */
+
 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H