diff --git a/LCX_ABT.sol b/LCX_ABT.sol
index 21d8b96..601d104 100644
--- a/LCX_ABT.sol
+++ b/LCX_ABT.sol
@@ -2,20 +2,8 @@ pragma solidity ^0.4.19;
 
 /*
     Copyright 2018, Vicent Nos, Enrique Santos & Mireia Puig
-
-    This program 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.
-
-    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 General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
+    
+    https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
 
  */
 
diff --git a/LCX_CIF.sol b/LCX_CIF.sol
index f32ddeb..64df2a7 100644
--- a/LCX_CIF.sol
+++ b/LCX_CIF.sol
@@ -3,18 +3,7 @@ pragma solidity ^0.4.19;
 /*
     Copyright 2018, Vicent Nos, Enrique Santos & Mireia Puig
 
-    This program 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.
-
-    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 General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+    https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
 
 
  */
diff --git a/LCX_CYC.sol b/LCX_CYC.sol
index 60c018b..b01bbbd 100644
--- a/LCX_CYC.sol
+++ b/LCX_CYC.sol
@@ -3,19 +3,7 @@ pragma solidity 0.4.24;
 /*
     Copyright 2018, Vicent Nos, Enrique Santos & Mireia Puig
 
-    This program 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.
-
-    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 General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
+    https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
 
  */
 
diff --git a/LCX_Certificates_X509.sol b/LCX_Certificates_X509.sol
index b401541..10fc05a 100644
--- a/LCX_Certificates_X509.sol
+++ b/LCX_Certificates_X509.sol
@@ -5,18 +5,7 @@ pragma solidity ^0.4.20;
 /*
     Copyright 2018, Vicent Nos & Enrique Santos
 
-    This program 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.
-
-    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 General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+    https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
     
 
  */
diff --git a/LCX_ISC.sol b/LCX_ISC.sol
index 89ec664..a54729f 100644
--- a/LCX_ISC.sol
+++ b/LCX_ISC.sol
@@ -3,18 +3,7 @@ pragma solidity ^0.4.24;
 /*
     Copyright 2018, Vicent Nos, Enrique Santos & Mireia Puig
 
-    This program 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.
-
-    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 General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+    https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
 
  */
 
diff --git a/SolRsaVerify.sol b/SolRsaVerify.sol
deleted file mode 100644
index 4ed1e80..0000000
--- a/SolRsaVerify.sol
+++ /dev/null
@@ -1,377 +0,0 @@
-pragma solidity ^0.4.15;
-
-/*
-    Copyright 2016, Adrià Massanet
-
-    This program 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.
-
-    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 General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-    
-    Checked results with FIPS test vectors
-    https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Algorithm-Validation-Program/documents/dss/186-3rsatestvectors.zip
-    file SigVer15_186-3.rsp
-    
- */
-
-contract SolRsaVerify {
-
-    function memcpy(uint dest, uint src, uint len) private {
-        // Copy word-length chunks while possible
-        for(; len >= 32; len -= 32) {
-            assembly {
-                mstore(dest, mload(src))
-            }
-            dest += 32;
-            src += 32;
-        }
-
-        // Copy remaining bytes
-        uint mask = 256 ** (32 - len) - 1;
-        assembly {
-            let srcpart := and(mload(src), not(mask))
-            let destpart := and(mload(dest), mask)
-            mstore(dest, or(destpart, srcpart))
-        }
-    }
-
-
-    uint8[]  SHA256PREFIX = [
-        0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20
-    ];
-    
-    function join(bytes s, bytes e, bytes m) internal returns (bytes) {
-        uint input_len = 0x60+s.length+e.length+m.length;
-        
-        uint s_len = s.length;
-        uint e_len = e.length;
-        uint m_len = m.length;
-        uint s_ptr;
-        uint e_ptr;
-        uint m_ptr;
-        uint input_ptr;
-        
-        bytes memory input = new bytes(input_len);
-        assembly {
-            s_ptr := add(s,0x20)
-            e_ptr := add(e,0x20)
-            m_ptr := add(m,0x20)
-            mstore(add(input,0x20),s_len)
-            mstore(add(input,0x40),e_len)
-            mstore(add(input,0x60),m_len)
-            input_ptr := add(input,0x20)
-        }
-        memcpy(input_ptr+0x60,s_ptr,s.length);        
-        memcpy(input_ptr+0x60+s.length,e_ptr,e.length);        
-        memcpy(input_ptr+0x60+s.length+e.length,m_ptr,m.length);
-
-        return input;
-    }
-
-    function pkcs1Sha256Verify(bytes32 hash, bytes s, bytes e, bytes m) returns (uint){
-        uint i;
-        
-      	require(m.length >= SHA256PREFIX.length+hash.length+11);
-
-        /// decipher
-        bytes memory input = join(s,e,m);
-        uint input_len = input.length;
-
-        uint decipherlen = m.length;
-        bytes memory decipher=new bytes(decipherlen);
-        bool success;
-		assembly {
-			success := call(sub(gas, 2000), 5, 0, add(input,0x20), input_len, add(decipher,0x20), decipherlen)
-			switch success case 0 { invalid }
-		}
-
-        /// 0x00 || 0x01 || PS || 0x00 || DigestInfo
-        /// PS is padding filled with 0xff
-        //  DigestInfo ::= SEQUENCE {
-        //     digestAlgorithm AlgorithmIdentifier,
-        //     digest OCTET STRING
-        //  }
-        
-        uint paddingLen = decipherlen - 3 - SHA256PREFIX.length - 32;
-        
-        if (decipher[0] != 0 || decipher[1] != 1) {
-            return 1;
-        }
-        for (i=2;i<2+paddingLen;i++) {
-            if (decipher[i] != 0xff) {
-                return 2;
-            }
-        }
-        if (decipher[2+paddingLen] != 0) {
-            return 3;
-        }
-        for (i=0;i<SHA256PREFIX.length;i++) {
-            if (uint8(decipher[3+paddingLen+i])!=SHA256PREFIX[i]) {
-                return 4;
-            }
-        }
-        for (i=0;i<hash.length;i++) {
-            if (decipher[3+paddingLen+SHA256PREFIX.length+i]!=hash[i]) {
-                return 5;
-            }
-        }
-
-        return 0;
-    }
-
-    function uints2bytes(uint[4] memory v) returns (bytes) {
-        bytes memory b = new bytes(4*32);
-        uint v_ptr;
-        uint b_ptr;
-        assembly {
-            v_ptr := v
-            b_ptr := add(b,0x20)
-        }
-         memcpy(b_ptr,v_ptr,b.length); 
-         return b;
-    }
-    function uints2bytes(uint[1] memory v) returns (bytes) {
-        bytes memory b = new bytes(32);
-        uint v_ptr;
-        uint b_ptr;
-        assembly {
-            v_ptr := v
-            b_ptr := add(b,0x20)
-        }
-        memcpy(b_ptr,v_ptr,b.length); 
-        return b;
-    }
-
-    function test_fips_sha256_success() {
-        
-        uint[4] memory s = [
-            0x5f49d8dc4519d9520d6542eca08cafb2d99cdb97c5a8685df2476b40505a2f9e,
-            0x8d63d76516b83481e2d961a7e8dc5f9f46887e394776711b0f85e4303065c06d,
-            0x362456bc219fc6eb343ede6733f779f75853533bc9ab876188da8ad98f9ea2f3,
-            0x35d2ceec34ef9cb2782bb0f79cad309608ddc222e00ebcff9d14f6e6ed39638b
-        ];
-        
-        uint[1] memory e = [
-            uint(0x10001)
-        ];
-        
-        uint[4] memory m = [
-            0xa8d68acd413c5e195d5ef04e1b4faaf242365cb450196755e92e1215ba59802a,
-            0xafbadbf2564dd550956abb54f8b1c917844e5f36195d1088c600e07cada5c080,
-            0xede679f50b3de32cf4026e514542495c54b1903768791aae9e36f082cd38e941,
-            0xada89baecada61ab0dd37ad536bcb0a0946271594836e92ab5517301d45176b5
-        ];
-        
-        uint[4] memory data = [
-            0xf56379c42e3ba856585ca28f7fb768f65d273a5fc546156142857b0afb7c72d2,
-            0xd97ecfceec71b4260bdc58c9bb42065f53af69805d9006233ec70a591aff463b,
-            0xf23d78200fb8cc14a4eba286afe8924120efad9e3d3f06f7452c725e53728b8f,
-            0x86c9fb245fbaf7086ab0092e215213830d1091212efc1ec59ddc3a83707d4ab8
-        ];
-        
-        bytes memory sb = uints2bytes(s);
-        bytes memory eb = uints2bytes(e);
-        bytes memory mb = uints2bytes(m);
-        bytes memory datab = uints2bytes(data);
-        
-        assert(pkcs1Sha256Verify(sha256(datab),sb,eb,mb)==0);
-
-    }
-
-    function test_fips_sha256_em_00_end_pad_removed() {
-        
-        uint[4] memory s = [
-            0x06317d3df0fa7ae350729ae2096b050dcec8909d36681ccca09a7a527b90767f,
-            0x8c2318c49e09483b48df77ddb632d6ca721155165389f7795d3ede7046567864,
-            0x9399242aed6d984ca74fc6c2eb4dd4bb2cd7bf2125ec853f2bf757d665b29487,
-            0xbc5b63df0d0b03b18608d3d9a7576ea0954aef3d3303f7d8fd7e7f9725c114e2
-        ];
-        
-        uint[1] memory e = [
-            uint(0x10001)
-        ];
-        
-        uint[4] memory m = [
-            0xa8d68acd413c5e195d5ef04e1b4faaf242365cb450196755e92e1215ba59802a,
-            0xafbadbf2564dd550956abb54f8b1c917844e5f36195d1088c600e07cada5c080,
-            0xede679f50b3de32cf4026e514542495c54b1903768791aae9e36f082cd38e941,
-            0xada89baecada61ab0dd37ad536bcb0a0946271594836e92ab5517301d45176b5
-        ];
-        
-        uint[4] memory data = [
-            0xb8518b80a55b365eb1850e18f88da2941c99543c2f865df3d37d114d9fc764ff,
-            0xc5e2ae94f2d4ab6276bfc6bda5b6976a7dcfaa56897982880410dd5542af3ad3,
-            0x4c469990cbec828327764842ef488f767c6b0c8cd1e08caec63438f2665517d1,
-            0x95a4d4daf64bc2a70bd11d119eec93a060960245d162844c5f11a98cd26003e1
-        ];
-        
-        bytes memory sb = uints2bytes(s);
-        bytes memory eb = uints2bytes(e);
-        bytes memory mb = uints2bytes(m);
-        bytes memory datab = uints2bytes(data);
-        
-        assert(pkcs1Sha256Verify(sha256(datab),sb,eb,mb)==3);
-
-    }
-
-    function test_fips_sha256_em_moved_left() {
-        
-        uint[4] memory s = [
-            0xa62e4b688bb3c4c2e11a3a0b1ef81ff4bbaa110c9b830d02bda2d364dadb2345,
-            0xa8c5dca58c611515f0c09732ee6a6642d5c5c339460a9d15022f48c36e9bc2fb,
-            0x8b2b0ff99005273287b8c3bed87993baf52f0e9d079281bc25a8694ed9692446,
-            0x127c26c34f21e610a84f3617247ecfb3b5337fe59d1239dfb7fdac8694dbef0b
-        ];
-        
-        uint[1] memory e = [
-            uint(0x10001)
-        ];
-        
-        uint[4] memory m = [
-            0xa8d68acd413c5e195d5ef04e1b4faaf242365cb450196755e92e1215ba59802a,
-            0xafbadbf2564dd550956abb54f8b1c917844e5f36195d1088c600e07cada5c080,
-            0xede679f50b3de32cf4026e514542495c54b1903768791aae9e36f082cd38e941,
-            0xada89baecada61ab0dd37ad536bcb0a0946271594836e92ab5517301d45176b5
-        ];
-        
-        uint[4] memory data = [
-            0x399b54f756514628f32ce8f1cf391d77047af55f3d43804923e5e09a188aa27f,
-            0x28604f2f3cfa3d7091f3ab5c69d40d650137a597c22d531dbbdeae074f6f534a,
-            0x2b297e087cd7d7125e6f8eac97f5a990859d9d3555301c5076b02f9c4d3f84d6,
-            0x2b3d090c7cb1ba1841eab668c066990079f206c15d1383eb3ba58ae17bc2dc2c
-        ];
-        
-        bytes memory sb = uints2bytes(s);
-        bytes memory eb = uints2bytes(e);
-        bytes memory mb = uints2bytes(m);
-        bytes memory datab = uints2bytes(data);
-        
-        assert(pkcs1Sha256Verify(sha256(datab),sb,eb,mb)==2);
-
-    }
-
-    function test_fips_sha256_e_changed() {
-        
-        uint[4] memory s = [
-            0x0ac6e41252383ee5d07f4fb08a22204f56440a8f3c8568d6e6bae46cfc9d39b6,
-            0x5b2eae827164d716e9e465301d08fca7356ef447e0699feabbfac16ed19dc923,
-            0x3b457fe64d6fab38aca4464e5cd3eae3f43bab17856cdcc942e2cc848b7bf390,
-            0xfc53b3ed2e6f63c5d961bc83475ac200708f6e1d5be30cbe24fe4d3dad754269
-        ];
-        
-        uint[1] memory e = [
-            uint(0x3)
-        ];
-        
-        uint[4] memory m = [
-            0xa8d68acd413c5e195d5ef04e1b4faaf242365cb450196755e92e1215ba59802a,
-            0xafbadbf2564dd550956abb54f8b1c917844e5f36195d1088c600e07cada5c080,
-            0xede679f50b3de32cf4026e514542495c54b1903768791aae9e36f082cd38e941,
-            0xada89baecada61ab0dd37ad536bcb0a0946271594836e92ab5517301d45176b5
-        ];
-        
-        uint[4] memory data = [
-            0x9be28a4763c6665880c1c2a8a74494622be46de3c20e5b118cf70fee51d33b6d,
-            0x0b473e84a4200382004526a33eea59e13b07070e580937207ec7b2cc5fb76856,
-            0xfe6210a771150fa0e5da9baee4a6209ed3d4e2b3bfd2e5f6591b0ace3e657ad0,
-            0x7c1b47d8520d5159386767f11fdfaf41fa3348fb7dd32d3c25da5d1d78433985
-        ];
-        
-        bytes memory sb = uints2bytes(s);
-        bytes memory eb = uints2bytes(e);
-        bytes memory mb = uints2bytes(m);
-        bytes memory datab = uints2bytes(data);
-        
-        assert(pkcs1Sha256Verify(sha256(datab),sb,eb,mb)==1);
-
-    }
-    
-    function test_fips_sha256_signature_changed() {
-        
-        uint[4] memory s = [
-            0x750e59f29d2dfeedab2a3a09034904715957149126c63e6a2dc7a633a32c4c05,
-            0x61d54eeb1479cb65274bac37cac4751f4dffdfb7530171599b61d94862845f6c,
-            0xd12a5e0bd6adabc36f06d216a00b1942349710540555106aeb87f5cf3f78df91,
-            0x8f36cf63291ef2a7064e31b84075d1c8b551225a25f59c721a3d77046078557f
-        ];
-        
-        uint[1] memory e = [
-            uint(0x10001)
-        ];
-        
-        uint[4] memory m = [
-            0xa8d68acd413c5e195d5ef04e1b4faaf242365cb450196755e92e1215ba59802a,
-            0xafbadbf2564dd550956abb54f8b1c917844e5f36195d1088c600e07cada5c080,
-            0xede679f50b3de32cf4026e514542495c54b1903768791aae9e36f082cd38e941,
-            0xada89baecada61ab0dd37ad536bcb0a0946271594836e92ab5517301d45176b5
-        ];
-        
-        uint[4] memory data = [
-            0xa6ce108ff3100b953781496c3d081fe32b8cedaf6d14aab2ef2dc37d8f8d2613,
-            0xd2f599efd55c51498749c0961681ae4ea7e28bf14a8f044c2d4dd4f9102ddd25,
-            0xf86c7795289708eb4df2d526f91b176952eb52fd0c9de2989432d6e08e13022b,
-            0x82f95089d20a5704f0452f26cd1f83bc956ee7da99876c1f8da3723af388bead
-        ];
-        
-        bytes memory sb = uints2bytes(s);
-        bytes memory eb = uints2bytes(e);
-        bytes memory mb = uints2bytes(m);
-        bytes memory datab = uints2bytes(data);
-        
-        assert(pkcs1Sha256Verify(sha256(datab),sb,eb,mb)==1);
-
-    }    
- 
-    function test_fips_sha256_message_changed() {
-        
-        uint[4] memory s = [
-            0x8b5a3675f397841c53a9021dad71a1efab91451c71ad7060ce85d75b306d6403,
-            0xba23d3370b0695be87485cf6680204c68424bc7e442ef90ac01c4df420ef5742,
-            0x94823250a000d56a5d00947800dcb2f4947f5b4eb18fa1dbdc6ab16be4b71311,
-            0x02d4dff98ddeac38554473964d29cdc521ee690cde5a8cd16889aa090c32c53e
-        ];
-        
-        uint[1] memory e = [
-            uint(0x10001)
-        ];
-        
-        uint[4] memory m = [
-            0xa8d68acd413c5e195d5ef04e1b4faaf242365cb450196755e92e1215ba59802a,
-            0xafbadbf2564dd550956abb54f8b1c917844e5f36195d1088c600e07cada5c080,
-            0xede679f50b3de32cf4026e514542495c54b1903768791aae9e36f082cd38e941,
-            0xada89baecada61ab0dd37ad536bcb0a0946271594836e92ab5517301d45176b5
-        ];
-        
-        uint[4] memory data = [
-            0xff23e00f819bae424e41d6b762ea6b88801e651c831c964af31de0c1d6dda4a7,
-            0xc8587d804ed12f526819da06650e7412fb627555979ed442f2663341e5fe5752,
-            0x7e0ddaf453a124451674976a6a6e0a31f56a79f5b73dfac39af4f3ba4a5e8bb8,
-            0x46cb5e333812756482d975ab1910162f96bfd7c58a02f113125189f5ac05291f
-        ];
-        
-        bytes memory sb = uints2bytes(s);
-        bytes memory eb = uints2bytes(e);
-        bytes memory mb = uints2bytes(m);
-        bytes memory datab = uints2bytes(data);
-        
-        assert(pkcs1Sha256Verify(sha256(datab),sb,eb,mb)==5);
-
-    }  
-    
-    function alltests() {
-        test_fips_sha256_success();
-        test_fips_sha256_em_00_end_pad_removed();
-        test_fips_sha256_em_moved_left();
-        test_fips_sha256_e_changed();
-        test_fips_sha256_signature_changed();
-        test_fips_sha256_message_changed();
-    }
-}
diff --git a/tests/contracts/LCX_ABT.sol b/tests/contracts/LCX_ABT.sol
index 56e5f26..2f1fdf1 100644
--- a/tests/contracts/LCX_ABT.sol
+++ b/tests/contracts/LCX_ABT.sol
@@ -3,19 +3,7 @@ pragma solidity ^0.4.19;
 /*
     Copyright 2018, Vicent Nos, Enrique Santos & Mireia Puig
 
-    This program 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.
-
-    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 General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
+    https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
 
  */
 
diff --git a/tests/contracts/LCX_CIF.sol b/tests/contracts/LCX_CIF.sol
index 4379451..d799e28 100644
--- a/tests/contracts/LCX_CIF.sol
+++ b/tests/contracts/LCX_CIF.sol
@@ -3,19 +3,7 @@ pragma solidity ^0.4.19;
 /*
     Copyright 2018, Vicent Nos, Enrique Santos & Mireia Puig
 
-    This program 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.
-
-    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 General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
+    https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
 
  */
 
diff --git a/tests/contracts/LCX_CYC.sol b/tests/contracts/LCX_CYC.sol
index fb078e1..4986f76 100644
--- a/tests/contracts/LCX_CYC.sol
+++ b/tests/contracts/LCX_CYC.sol
@@ -3,19 +3,7 @@ pragma solidity 0.4.24;
 /*
     Copyright 2018, Vicent Nos, Enrique Santos & Mireia Puig
 
-    This program 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.
-
-    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 General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
+    https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
 
  */
 
diff --git a/tests/contracts/LCX_ISC.sol b/tests/contracts/LCX_ISC.sol
index 1627e96..08e7575 100644
--- a/tests/contracts/LCX_ISC.sol
+++ b/tests/contracts/LCX_ISC.sol
@@ -3,18 +3,7 @@ pragma solidity ^0.4.24;
 /*
     Copyright 2018, Vicent Nos, Enrique Santos & Mireia Puig
 
-    This program 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.
-
-    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 General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+    https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
 
  */
 
diff --git a/tests/contracts/LCX_ISC2.sol b/tests/contracts/LCX_ISC2.sol
index 76ee922..36f4a1a 100644
--- a/tests/contracts/LCX_ISC2.sol
+++ b/tests/contracts/LCX_ISC2.sol
@@ -3,19 +3,7 @@ pragma solidity ^0.4.19;
 /*
     Copyright 2018, Vicent Nos, Enrique Santos & Mireia Puig
 
-    This program 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.
-
-    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 General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
+    https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
 
  */