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/zcash/Address.cpp

@@ -1,6 +1,6 @@
 // Copyright (c) 2019-2020 The Hush 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 "Address.hpp"
 #include "NoteEncryption.hpp"

src/zcash/Address.hpp

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #ifndef ZC_ADDRESS_H_
 #define ZC_ADDRESS_H_

src/zcash/IncrementalMerkleTree.cpp

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #include <stdexcept>
 

src/zcash/IncrementalMerkleTree.hpp

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #ifndef ZC_INCREMENTALMERKLETREE_H_
 #define ZC_INCREMENTALMERKLETREE_H_

src/zcash/JoinSplit.cpp

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 #include "JoinSplit.hpp"
 #include "prf.h"
 #include "sodium.h"

src/zcash/JoinSplit.hpp

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #ifndef ZC_JOINSPLIT_H_
 #define ZC_JOINSPLIT_H_

src/zcash/Note.cpp

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #include "Note.hpp"
 #include "prf.h"

src/zcash/Note.hpp

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #ifndef ZC_NOTE_H_
 #define ZC_NOTE_H_

src/zcash/NoteEncryption.cpp

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #include "NoteEncryption.hpp"
 #include <stdexcept>

src/zcash/NoteEncryption.hpp

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #ifndef ZC_NOTE_ENCRYPTION_H_
 #define ZC_NOTE_ENCRYPTION_H_

src/zcash/Proof.cpp

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #include "Proof.hpp"
 

src/zcash/Proof.hpp

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #ifndef ZC_PROOF_H_
 #define ZC_PROOF_H_

src/zcash/Zcash.h

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 #ifndef ZC_ZCASH_H_
 #define ZC_ZCASH_H_
 

src/zcash/prf.cpp

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #include "prf.h"
 #include "crypto/sha256.h"

src/zcash/prf.h

@@ -1,7 +1,8 @@
-/*
-Zcash uses SHA256Compress as a PRF for various components
-within the zkSNARK circuit.
-*/
+// Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
+// Zcash uses SHA256Compress as a PRF for various components
+// within the zkSNARK circuit.
 
 #ifndef ZC_PRF_H_
 #define ZC_PRF_H_

src/zcash/util.cpp

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
 #include "zcash/util.h"
 #include <algorithm>

src/zcash/util.h

@@ -1,4 +1,6 @@
 // Copyright (c) 2019-2020 The Hush developers
+// Distributed under the GPLv3 software license, see the accompanying
+// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 #ifndef ZC_UTIL_H_
 #define ZC_UTIL_H_
 

src/zcash/zip32.cpp

@@ -1,7 +1,7 @@
 // Copyright (c) 2018 The Zcash developers
 // Copyright (c) 2019-2020 The Hush 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 "zip32.h"
 

src/zcash/zip32.h

@@ -1,7 +1,7 @@
 // Copyright (c) 2018 The Zcash developers
 // Copyright (c) 2019-2020 The Hush 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 ZCASH_ZIP32_H
 #define ZCASH_ZIP32_H