diff --git a/rjp++/include/rjp.hpp b/rjp++/include/rjp.hpp
index 0af0fac..25e292b 100644
--- a/rjp++/include/rjp.hpp
+++ b/rjp++/include/rjp.hpp
@@ -1,3 +1,24 @@
+/**
+	rjp++
+	Copyright (C) 2020 rexy712
+
+	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 RJP_HPP_INCLUDED
+#define RJP_HPP_INCLUDED
+
 #include <rjp.h>
 #include <rexy/string.hpp>
 
@@ -276,3 +297,5 @@ namespace rjp{
 
 	string to_json(const value& val, int format = RJP_FORMAT_PRETTY);
 }
+
+#endif
diff --git a/rjp++/src/allocator.cpp b/rjp++/src/allocator.cpp
index 07e3cc9..05c571f 100644
--- a/rjp++/src/allocator.cpp
+++ b/rjp++/src/allocator.cpp
@@ -1,3 +1,21 @@
+/**
+	rjp++
+	Copyright (C) 2020 rexy712
+
+	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 <rjp.hpp>
 #include <cstring> //memcpy
 
diff --git a/rjp++/src/array.cpp b/rjp++/src/array.cpp
index a5be430..453275f 100644
--- a/rjp++/src/array.cpp
+++ b/rjp++/src/array.cpp
@@ -1,3 +1,21 @@
+/**
+	rjp++
+	Copyright (C) 2020 rexy712
+
+	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 <rjp.hpp>
 #include <utility> //move
 
diff --git a/rjp++/src/integral.cpp b/rjp++/src/integral.cpp
index 3dd4697..e75e8f4 100644
--- a/rjp++/src/integral.cpp
+++ b/rjp++/src/integral.cpp
@@ -1,3 +1,21 @@
+/**
+	rjp++
+	Copyright (C) 2020 rexy712
+
+	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 <rjp.hpp>
 #include <utility> //move
 
diff --git a/rjp++/src/object.cpp b/rjp++/src/object.cpp
index ea93abc..77141a7 100644
--- a/rjp++/src/object.cpp
+++ b/rjp++/src/object.cpp
@@ -1,3 +1,21 @@
+/**
+	rjp++
+	Copyright (C) 2020 rexy712
+
+	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 <rjp.hpp>
 #include <rexy/string_base.hpp>
 #include <utility> //move
diff --git a/rjp++/src/rjp.cpp b/rjp++/src/rjp.cpp
index ca6ed74..fa70f7a 100644
--- a/rjp++/src/rjp.cpp
+++ b/rjp++/src/rjp.cpp
@@ -1,3 +1,21 @@
+/**
+	rjp++
+	Copyright (C) 2020 rexy712
+
+	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 <rjp.hpp>
 
 namespace rjp{
diff --git a/rjp++/src/string.cpp b/rjp++/src/string.cpp
index 27ead1a..96ef3f4 100644
--- a/rjp++/src/string.cpp
+++ b/rjp++/src/string.cpp
@@ -1,3 +1,21 @@
+/**
+	rjp++
+	Copyright (C) 2020 rexy712
+
+	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 <rexy/string_base.hpp>
 #include <rjp.hpp>
 #include <utility> //exchange
diff --git a/rjp++/src/string_val.cpp b/rjp++/src/string_val.cpp
index e0d3c10..2721170 100644
--- a/rjp++/src/string_val.cpp
+++ b/rjp++/src/string_val.cpp
@@ -1,3 +1,21 @@
+/**
+	rjp++
+	Copyright (C) 2020 rexy712
+
+	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 <rjp.hpp>
 #include <rexy/string_base.hpp>
 #include <utility> //move
diff --git a/rjp++/src/value.cpp b/rjp++/src/value.cpp
index 1083c5d..a4d5a0d 100644
--- a/rjp++/src/value.cpp
+++ b/rjp++/src/value.cpp
@@ -1,3 +1,21 @@
+/**
+	rjp++
+	Copyright (C) 2020 rexy712
+
+	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 <rjp.hpp>
 #include <utility> //swap, move, exchange