diff --git a/include/inja/config.hpp b/include/inja/config.hpp
index 01bfa6d..42b55c8 100644
--- a/include/inja/config.hpp
+++ b/include/inja/config.hpp
@@ -1,5 +1,3 @@
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_CONFIG_HPP_
 #define INCLUDE_INJA_CONFIG_HPP_
 
diff --git a/include/inja/environment.hpp b/include/inja/environment.hpp
index 2b6248b..c4bd7de 100644
--- a/include/inja/environment.hpp
+++ b/include/inja/environment.hpp
@@ -1,5 +1,3 @@
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_ENVIRONMENT_HPP_
 #define INCLUDE_INJA_ENVIRONMENT_HPP_
 
diff --git a/include/inja/exceptions.hpp b/include/inja/exceptions.hpp
index 9b349a4..9991f0d 100644
--- a/include/inja/exceptions.hpp
+++ b/include/inja/exceptions.hpp
@@ -1,5 +1,3 @@
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_EXCEPTIONS_HPP_
 #define INCLUDE_INJA_EXCEPTIONS_HPP_
 
diff --git a/include/inja/function_storage.hpp b/include/inja/function_storage.hpp
index b4bd092..3e8e513 100644
--- a/include/inja/function_storage.hpp
+++ b/include/inja/function_storage.hpp
@@ -1,5 +1,3 @@
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_FUNCTION_STORAGE_HPP_
 #define INCLUDE_INJA_FUNCTION_STORAGE_HPP_
 
diff --git a/include/inja/inja.hpp b/include/inja/inja.hpp
index ed830e7..5e2643b 100644
--- a/include/inja/inja.hpp
+++ b/include/inja/inja.hpp
@@ -1,4 +1,26 @@
-// Copyright (c) 2021 Pantor. All rights reserved.
+/*
+  ___        _          Version 3.2
+ |_ _|_ __  (_) __ _    https://github.com/pantor/inja
+  | || '_ \ | |/ _` |   Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+  | || | | || | (_| |
+ |___|_| |_|/ |\__,_|   Copyright (c) 2018-2021 Lars Berscheid
+          |__/       
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
 
 #ifndef INCLUDE_INJA_INJA_HPP_
 #define INCLUDE_INJA_INJA_HPP_
diff --git a/include/inja/lexer.hpp b/include/inja/lexer.hpp
index 158f8b2..58768e4 100644
--- a/include/inja/lexer.hpp
+++ b/include/inja/lexer.hpp
@@ -1,5 +1,3 @@
-// Copyright (c) 2020 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_LEXER_HPP_
 #define INCLUDE_INJA_LEXER_HPP_
 
diff --git a/include/inja/node.hpp b/include/inja/node.hpp
index 43a6ef3..cafd83c 100644
--- a/include/inja/node.hpp
+++ b/include/inja/node.hpp
@@ -1,5 +1,3 @@
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_NODE_HPP_
 #define INCLUDE_INJA_NODE_HPP_
 
diff --git a/include/inja/parser.hpp b/include/inja/parser.hpp
index 0c1f867..6eea857 100644
--- a/include/inja/parser.hpp
+++ b/include/inja/parser.hpp
@@ -1,5 +1,3 @@
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_PARSER_HPP_
 #define INCLUDE_INJA_PARSER_HPP_
 
diff --git a/include/inja/renderer.hpp b/include/inja/renderer.hpp
index e299db5..54e7322 100644
--- a/include/inja/renderer.hpp
+++ b/include/inja/renderer.hpp
@@ -1,5 +1,3 @@
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_RENDERER_HPP_
 #define INCLUDE_INJA_RENDERER_HPP_
 
diff --git a/include/inja/statistics.hpp b/include/inja/statistics.hpp
index 48d129a..3ab4c37 100644
--- a/include/inja/statistics.hpp
+++ b/include/inja/statistics.hpp
@@ -1,5 +1,3 @@
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_STATISTICS_HPP_
 #define INCLUDE_INJA_STATISTICS_HPP_
 
diff --git a/include/inja/template.hpp b/include/inja/template.hpp
index cc32bfe..45b276b 100644
--- a/include/inja/template.hpp
+++ b/include/inja/template.hpp
@@ -1,5 +1,3 @@
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_TEMPLATE_HPP_
 #define INCLUDE_INJA_TEMPLATE_HPP_
 
diff --git a/include/inja/token.hpp b/include/inja/token.hpp
index 3fb4c23..1904c4d 100644
--- a/include/inja/token.hpp
+++ b/include/inja/token.hpp
@@ -1,5 +1,3 @@
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_TOKEN_HPP_
 #define INCLUDE_INJA_TOKEN_HPP_
 
diff --git a/include/inja/utils.hpp b/include/inja/utils.hpp
index 4336833..d993f3f 100644
--- a/include/inja/utils.hpp
+++ b/include/inja/utils.hpp
@@ -1,5 +1,3 @@
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_UTILS_HPP_
 #define INCLUDE_INJA_UTILS_HPP_
 
diff --git a/single_include/inja/inja.hpp b/single_include/inja/inja.hpp
index 509f5e7..a19efe9 100644
--- a/single_include/inja/inja.hpp
+++ b/single_include/inja/inja.hpp
@@ -1,4 +1,26 @@
-// Copyright (c) 2021 Pantor. All rights reserved.
+/*
+  ___        _          Version 3.2
+ |_ _|_ __  (_) __ _    https://github.com/pantor/inja
+  | || '_ \ | |/ _` |   Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+  | || | | || | (_| |
+ |___|_| |_|/ |\__,_|   Copyright (c) 2018-2021 Lars Berscheid
+          |__/       
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
 
 #ifndef INCLUDE_INJA_INJA_HPP_
 #define INCLUDE_INJA_INJA_HPP_
@@ -20,8 +42,6 @@
 #endif
 
 // #include "environment.hpp"
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_ENVIRONMENT_HPP_
 #define INCLUDE_INJA_ENVIRONMENT_HPP_
 
@@ -34,8 +54,6 @@
 #include <nlohmann/json.hpp>
 
 // #include "config.hpp"
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_CONFIG_HPP_
 #define INCLUDE_INJA_CONFIG_HPP_
 
@@ -1534,8 +1552,6 @@
 #endif // INCLUDE_INJA_CONFIG_HPP_
 
 // #include "function_storage.hpp"
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_FUNCTION_STORAGE_HPP_
 #define INCLUDE_INJA_FUNCTION_STORAGE_HPP_
 
@@ -1681,8 +1697,6 @@
 #endif // INCLUDE_INJA_FUNCTION_STORAGE_HPP_
 
 // #include "parser.hpp"
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_PARSER_HPP_
 #define INCLUDE_INJA_PARSER_HPP_
 
@@ -1696,8 +1710,6 @@
 // #include "config.hpp"
 
 // #include "exceptions.hpp"
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_EXCEPTIONS_HPP_
 #define INCLUDE_INJA_EXCEPTIONS_HPP_
 
@@ -1750,8 +1762,6 @@
 // #include "function_storage.hpp"
 
 // #include "lexer.hpp"
-// Copyright (c) 2020 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_LEXER_HPP_
 #define INCLUDE_INJA_LEXER_HPP_
 
@@ -1761,8 +1771,6 @@
 // #include "config.hpp"
 
 // #include "token.hpp"
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_TOKEN_HPP_
 #define INCLUDE_INJA_TOKEN_HPP_
 
@@ -1840,8 +1848,6 @@
 #endif // INCLUDE_INJA_TOKEN_HPP_
 
 // #include "utils.hpp"
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_UTILS_HPP_
 #define INCLUDE_INJA_UTILS_HPP_
 
@@ -2355,8 +2361,6 @@
 #endif // INCLUDE_INJA_LEXER_HPP_
 
 // #include "node.hpp"
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_NODE_HPP_
 #define INCLUDE_INJA_NODE_HPP_
 
@@ -2735,8 +2739,6 @@
 #endif // INCLUDE_INJA_NODE_HPP_
 
 // #include "template.hpp"
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_TEMPLATE_HPP_
 #define INCLUDE_INJA_TEMPLATE_HPP_
 
@@ -2748,8 +2750,6 @@
 // #include "node.hpp"
 
 // #include "statistics.hpp"
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_STATISTICS_HPP_
 #define INCLUDE_INJA_STATISTICS_HPP_
 
@@ -3489,8 +3489,6 @@
 #endif // INCLUDE_INJA_PARSER_HPP_
 
 // #include "renderer.hpp"
-// Copyright (c) 2021 Pantor. All rights reserved.
-
 #ifndef INCLUDE_INJA_RENDERER_HPP_
 #define INCLUDE_INJA_RENDERER_HPP_