diff --git a/README.md b/README.md
index 6c11559..4fe79ea 100644
--- a/README.md
+++ b/README.md
@@ -86,7 +86,7 @@ Localization contributors:
 - Polish: [Atrate](https://github.com/Atrate)
 
 ## Dependencies
-* [TunProxy](https://github.com/raise-isayan/TunProxy) - VPN server and traffic interceptor
+* [NetGuard](https://github.com/M66B/NetGuard) / [TunProxy](https://github.com/raise-isayan/TunProxy) - VPN server and traffic interceptor
 * [LittleProxy](https://github.com/adamfisk/LittleProxy) - proxy server
 * [LittleProxy-MITM](https://github.com/ganskef/LittleProxy-mitm) - LittleProxy SSL extension
 * [dnsjava](https://github.com/dnsjava/dnsjava) - DNS library, DoH realization
diff --git a/app/src/main/cpp/dhcp.c b/app/src/main/cpp/dhcp.c
index cb8c5f9..d26b95a 100644
--- a/app/src/main/cpp/dhcp.c
+++ b/app/src/main/cpp/dhcp.c
@@ -1,4 +1,21 @@
+/*
+    This file is part of NetGuard.
 
+    NetGuard 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2015-2017 by Marcel Bokhorst (M66B)
+*/
 
 #include "tun2http.h"
 
diff --git a/app/src/main/cpp/dns.c b/app/src/main/cpp/dns.c
index 2e6c3e0..36af3f7 100644
--- a/app/src/main/cpp/dns.c
+++ b/app/src/main/cpp/dns.c
@@ -1,4 +1,21 @@
+/*
+    This file is part of NetGuard.
 
+    NetGuard 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2015-2017 by Marcel Bokhorst (M66B)
+*/
 #include "tun2http.h"
 
 int32_t get_qname(const uint8_t *data, const size_t datalen, uint16_t off, char *qname) {
diff --git a/app/src/main/cpp/http.c b/app/src/main/cpp/http.c
index 77fe6b5..4afe8a0 100644
--- a/app/src/main/cpp/http.c
+++ b/app/src/main/cpp/http.c
@@ -1,3 +1,21 @@
+/*
+    This file is part of NetGuard.
+
+    NetGuard 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2015-2017 by Marcel Bokhorst (M66B)
+*/
 
 #include <stdio.h>
 #include <stdlib.h> /* malloc() */
diff --git a/app/src/main/cpp/http.h b/app/src/main/cpp/http.h
index b940966..22b247e 100644
--- a/app/src/main/cpp/http.h
+++ b/app/src/main/cpp/http.h
@@ -1,3 +1,21 @@
+/*
+    This file is part of NetGuard.
+
+    NetGuard 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2015-2017 by Marcel Bokhorst (M66B)
+*/
 
 #ifndef TUN2HTTP_HTTP_H
 #define TUN2HTTP_HTTP_H
diff --git a/app/src/main/cpp/icmp.c b/app/src/main/cpp/icmp.c
index 0f5efbd..00d10f4 100644
--- a/app/src/main/cpp/icmp.c
+++ b/app/src/main/cpp/icmp.c
@@ -1,3 +1,21 @@
+/*
+    This file is part of NetGuard.
+
+    NetGuard 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2015-2017 by Marcel Bokhorst (M66B)
+*/
 
 #include "tun2http.h"
 
diff --git a/app/src/main/cpp/ip.c b/app/src/main/cpp/ip.c
index 7b65fc5..40a5ba7 100644
--- a/app/src/main/cpp/ip.c
+++ b/app/src/main/cpp/ip.c
@@ -1,3 +1,21 @@
+/*
+    This file is part of NetGuard.
+
+    NetGuard 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2015-2017 by Marcel Bokhorst (M66B)
+*/
 
 #include "tun2http.h"
 
diff --git a/app/src/main/cpp/session.c b/app/src/main/cpp/session.c
index 0f5088f..911056b 100644
--- a/app/src/main/cpp/session.c
+++ b/app/src/main/cpp/session.c
@@ -1,3 +1,21 @@
+/*
+    This file is part of NetGuard.
+
+    NetGuard 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2015-2017 by Marcel Bokhorst (M66B)
+*/
 
 #include "tun2http.h"
 
diff --git a/app/src/main/cpp/tcp.c b/app/src/main/cpp/tcp.c
index a8d6cf1..77160c7 100644
--- a/app/src/main/cpp/tcp.c
+++ b/app/src/main/cpp/tcp.c
@@ -1,3 +1,22 @@
+/*
+    This file is part of NetGuard.
+
+    NetGuard 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2015-2017 by Marcel Bokhorst (M66B)
+*/
+
 #include "tun2http.h"
 #include "tls.h"
 #include "http.h"
diff --git a/app/src/main/cpp/tls.c b/app/src/main/cpp/tls.c
index 83a45df..5b83971 100644
--- a/app/src/main/cpp/tls.c
+++ b/app/src/main/cpp/tls.c
@@ -1,4 +1,21 @@
+/*
+    This file is part of NetGuard.
+
+    NetGuard 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
 
+    Copyright 2015-2017 by Marcel Bokhorst (M66B)
+*/
 
 #include <stdio.h>
 #include <stdlib.h> /* malloc() */
diff --git a/app/src/main/cpp/tls.h b/app/src/main/cpp/tls.h
index 9cfc6ac..41f86ae 100644
--- a/app/src/main/cpp/tls.h
+++ b/app/src/main/cpp/tls.h
@@ -1,4 +1,21 @@
+/*
+    This file is part of NetGuard.
 
+    NetGuard 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2015-2017 by Marcel Bokhorst (M66B)
+*/
 
 #ifndef TUN2HTTP_TLS_H
 #define TUN2HTTP_TLS_H
diff --git a/app/src/main/cpp/tun2http.c b/app/src/main/cpp/tun2http.c
index aefc240..bc60a6c 100644
--- a/app/src/main/cpp/tun2http.c
+++ b/app/src/main/cpp/tun2http.c
@@ -1,3 +1,21 @@
+/*
+    This file is part of NetGuard.
+
+    NetGuard 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2015-2017 by Marcel Bokhorst (M66B)
+*/
 
 #include "tun2http.h"
 
diff --git a/app/src/main/cpp/tun2http.h b/app/src/main/cpp/tun2http.h
index 33c22e1..65658d4 100644
--- a/app/src/main/cpp/tun2http.h
+++ b/app/src/main/cpp/tun2http.h
@@ -1,3 +1,22 @@
+/*
+    This file is part of NetGuard.
+
+    NetGuard 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2015-2017 by Marcel Bokhorst (M66B)
+*/
+
 #include <jni.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/app/src/main/cpp/udp.c b/app/src/main/cpp/udp.c
index b7a078f..17e8c4a 100644
--- a/app/src/main/cpp/udp.c
+++ b/app/src/main/cpp/udp.c
@@ -1,3 +1,21 @@
+/*
+    This file is part of NetGuard.
+
+    NetGuard 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2015-2017 by Marcel Bokhorst (M66B)
+*/
 
 #include "tun2http.h"
 
diff --git a/app/src/main/cpp/util.c b/app/src/main/cpp/util.c
index a7aefa7..909248a 100644
--- a/app/src/main/cpp/util.c
+++ b/app/src/main/cpp/util.c
@@ -1,4 +1,21 @@
+/*
+    This file is part of NetGuard.
 
+    NetGuard 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2015-2017 by Marcel Bokhorst (M66B)
+*/
 
 #include "tun2http.h"