diff --git a/src/sdk/src/crypto/wif.rs b/src/sdk/src/crypto/wif.rs
index bdfcdde53..78a121e54 100644
--- a/src/sdk/src/crypto/wif.rs
+++ b/src/sdk/src/crypto/wif.rs
@@ -1,3 +1,21 @@
+/* This file is part of DarkFi (https://dark.fi)
+ *
+ * Copyright (C) 2020-2023 Dyne.org foundation
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 use crate::{
     crypto::{
         constants::{MAINNET_ADDRS_PREFIX, TESTNET_ADDRS_PREFIX},