diff --git a/coin.h b/coin.h
index f6bdead..f51dee0 100644
--- a/coin.h
+++ b/coin.h
@@ -1,7 +1,7 @@
 // Copyright (c) 2018 The Bitcoin developers
-// Copyright (c) 2018-2019 The Hush developers
-// Distributed under the MIT/X11 software license, see the accompanying
-// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+// Copyright (c) 2018-2021 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 __INCLUDED_COIN_H__
 #define __INCLUDED_COIN_H__
diff --git a/compat.h b/compat.h
index 2461ff4..ca03ca6 100644
--- a/compat.h
+++ b/compat.h
@@ -1,7 +1,8 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2012 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+// Copyright (c) 2018-2021 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 _BITCOIN_COMPAT_H
 #define _BITCOIN_COMPAT_H 1
 
diff --git a/netbase.cpp b/netbase.cpp
index c866d35..e5c4d49 100644
--- a/netbase.cpp
+++ b/netbase.cpp
@@ -1,7 +1,8 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2012 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+// Copyright (c) 2018-2021 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 "netbase.h"
 #include "util.h"
diff --git a/netbase.h b/netbase.h
index d222177..0411dfa 100644
--- a/netbase.h
+++ b/netbase.h
@@ -1,6 +1,7 @@
 // Copyright (c) 2009-2012 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+// Copyright (c) 2018-2021 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 BITCOIN_NETBASE_H
 #define BITCOIN_NETBASE_H
 
diff --git a/protocol.cpp b/protocol.cpp
index 7d214fd..01707b3 100644
--- a/protocol.cpp
+++ b/protocol.cpp
@@ -1,8 +1,8 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2011 The Bitcoin developers
-// Copyright (c) 2018 The HUSH developers
-// Distributed under the MIT/X11 software license, see the accompanying
-// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+// Copyright (c) 2018-2021 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 <vector>
 #include <stdexcept>
diff --git a/protocol.h b/protocol.h
index 503f600..5e2ab51 100644
--- a/protocol.h
+++ b/protocol.h
@@ -1,8 +1,8 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2011 The Bitcoin developers
-// Copyright (c) 2018 The HUSH developers
-// Distributed under the MIT/X11 software license, see the accompanying
-// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+// Copyright (c) 2018-2021 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 __cplusplus
 # error This header can only be compiled as C++.
diff --git a/serialize.h b/serialize.h
index 02096b4..a5d08c2 100644
--- a/serialize.h
+++ b/serialize.h
@@ -1,8 +1,8 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2011 The Bitcoin developers
-// Copyright (c) 2018 The HUSH developers
-// Distributed under the MIT/X11 software license, see the accompanying
-// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+// Copyright (c) 2018-2021 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 BITCOIN_SERIALIZE_H
 #define BITCOIN_SERIALIZE_H
 
diff --git a/uint256.h b/uint256.h
index 66234b3..a05daea 100644
--- a/uint256.h
+++ b/uint256.h
@@ -1,7 +1,8 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2011 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
-// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+// Copyright (c) 2018-2021 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 BITCOIN_UINT256_H
 #define BITCOIN_UINT256_H