Hush Full Node is now GPLv3

Any projects which want to use Hush code from now on will need to be licensed as
GPLv3 or we will send the lawyers: https://www.softwarefreedom.org/

Notably, Komodo (KMD) is licensed as GPLv2 and is no longer compatible to receive
code changes, without causing legal issues. MIT projects, such as Zcash, also cannot pull
in changes from the Hush Full Node without permission from The Hush Developers,
which may in some circumstances grant an MIT license on a case-by-case basis.

src/compat/byteswap.h

@@ -1,6 +1,6 @@
 // Copyright (c) 2014 The Bitcoin developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or https://www.opensource.org/licenses/mit-license.php
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #ifndef BITCOIN_COMPAT_BYTESWAP_H
 #define BITCOIN_COMPAT_BYTESWAP_H

src/compat/endian.h

@@ -1,6 +1,6 @@
 // Copyright (c) 2014 The Bitcoin developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or https://www.opensource.org/licenses/mit-license.php
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #ifndef BITCOIN_COMPAT_ENDIAN_H
 #define BITCOIN_COMPAT_ENDIAN_H

src/compat/glibc_compat.cpp

@@ -1,6 +1,6 @@
 // Copyright (c) 2009-2014 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or https://www.opensource.org/licenses/mit-license.php
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #if defined(HAVE_CONFIG_H)
 #include "config/bitcoin-config.h"

src/compat/glibc_sanity.cpp

@@ -1,6 +1,6 @@
 // Copyright (c) 2009-2014 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or https://www.opensource.org/licenses/mit-license.php
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #if defined(HAVE_CONFIG_H)
 #include "config/bitcoin-config.h"

src/compat/glibcxx_sanity.cpp

@@ -1,6 +1,6 @@
 // Copyright (c) 2009-2014 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or https://www.opensource.org/licenses/mit-license.php
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #include <list>
 #include <locale>

src/compat/sanity.h

@@ -1,6 +1,6 @@
 // Copyright (c) 2009-2014 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or https://www.opensource.org/licenses/mit-license.php
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #ifndef BITCOIN_COMPAT_SANITY_H
 #define BITCOIN_COMPAT_SANITY_H

src/compat/strnlen.cpp

@@ -1,6 +1,6 @@
 // Copyright (c) 2009-2014 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or https://www.opensource.org/licenses/mit-license.php
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #if defined(HAVE_CONFIG_H)
 #include "config/bitcoin-config.h"