Add missing license (#70)

packages/contracts/LICENSE.txt

+(The MIT License)
+
+Copyright 2020 Optimism
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\ No newline at end of file

packages/contracts/contracts/optimistic-ethereum/OVM/accounts/OVM_ECDSAContractAccount.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/OVM/bridge/OVM_BaseCrossDomainMessenger.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/OVM/bridge/OVM_L1CrossDomainMessenger.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/OVM/bridge/OVM_L2CrossDomainMessenger.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.6.0 <0.8.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/OVM/chain/OVM_CanonicalTransactionChain.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/OVM/chain/OVM_StateCommitmentChain.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/OVM/execution/OVM_ExecutionManager.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/OVM/execution/OVM_SafetyChecker.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /* Interface Imports */

packages/contracts/contracts/optimistic-ethereum/OVM/execution/OVM_StateManager.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/OVM/execution/OVM_StateManagerFactory.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /* Interface Imports */

packages/contracts/contracts/optimistic-ethereum/OVM/precompiles/OVM_DeployerWhitelist.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /* Library Imports */

packages/contracts/contracts/optimistic-ethereum/OVM/precompiles/OVM_L1MessageSender.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /* Interface Imports */

packages/contracts/contracts/optimistic-ethereum/OVM/precompiles/OVM_L2ToL1MessagePasser.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.6.0 <0.8.0;
 
 /* Interface Imports */

packages/contracts/contracts/optimistic-ethereum/OVM/verification/OVM_BondManager.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /* Library Imports */

packages/contracts/contracts/optimistic-ethereum/OVM/verification/OVM_FraudContributor.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 import { iOVM_BondManager } from "../../iOVM/verification/iOVM_BondManager.sol";

packages/contracts/contracts/optimistic-ethereum/OVM/verification/OVM_FraudVerifier.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/OVM/verification/OVM_StateTransitioner.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/OVM/verification/OVM_StateTransitionerFactory.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /* Interface Imports */

packages/contracts/contracts/optimistic-ethereum/iOVM/accounts/iOVM_ECDSAContractAccount.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/iOVM/bridge/iOVM_BaseCrossDomainMessenger.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >=0.5.0 <0.8.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/iOVM/bridge/iOVM_L1CrossDomainMessenger.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/iOVM/bridge/iOVM_L2CrossDomainMessenger.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/iOVM/chain/iOVM_CanonicalTransactionChain.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/iOVM/chain/iOVM_StateCommitmentChain.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/iOVM/execution/iOVM_ExecutionManager.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/iOVM/execution/iOVM_SafetyChecker.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 
 /**

packages/contracts/contracts/optimistic-ethereum/iOVM/execution/iOVM_StateManager.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/iOVM/execution/iOVM_StateManagerFactory.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 
 /* Contract Imports */

packages/contracts/contracts/optimistic-ethereum/iOVM/precompiles/iOVM_DeployerWhitelist.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 
 /**

packages/contracts/contracts/optimistic-ethereum/iOVM/precompiles/iOVM_L1MessageSender.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 
 /**

packages/contracts/contracts/optimistic-ethereum/iOVM/precompiles/iOVM_L2ToL1MessagePasser.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 
 /**

packages/contracts/contracts/optimistic-ethereum/iOVM/verification/iOVM_BondManager.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 
 interface ERC20 {

packages/contracts/contracts/optimistic-ethereum/iOVM/verification/iOVM_FraudVerifier.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/iOVM/verification/iOVM_StateTransitioner.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/iOVM/verification/iOVM_StateTransitionerFactory.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity >0.5.0 <0.8.0;
 
 /* Contract Imports */

packages/contracts/contracts/optimistic-ethereum/libraries/codec/Lib_OVMCodec.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/libraries/resolver/Lib_AddressManager.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /* Contract Imports */

packages/contracts/contracts/optimistic-ethereum/libraries/resolver/Lib_AddressResolver.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /* Library Imports */

packages/contracts/contracts/optimistic-ethereum/libraries/resolver/Lib_ResolvedDelegateProxy.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /* Library Imports */

packages/contracts/contracts/optimistic-ethereum/libraries/rlp/Lib_RLPReader.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /**

packages/contracts/contracts/optimistic-ethereum/libraries/rlp/Lib_RLPWriter.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/libraries/trie/Lib_MerkleTrie.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /* Library Imports */

packages/contracts/contracts/optimistic-ethereum/libraries/trie/Lib_SecureMerkleTrie.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/libraries/utils/Lib_Bytes32Utils.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /**

packages/contracts/contracts/optimistic-ethereum/libraries/utils/Lib_BytesUtils.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /**

packages/contracts/contracts/optimistic-ethereum/libraries/utils/Lib_ECDSAUtils.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /**

packages/contracts/contracts/optimistic-ethereum/libraries/utils/Lib_EthUtils.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/libraries/utils/Lib_MerkleUtils.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/libraries/wrappers/Lib_SafeExecutionManagerWrapper.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /**

packages/contracts/contracts/optimistic-ethereum/mockOVM/accounts/mockOVM_ECDSAContractAccount.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/optimistic-ethereum/mockOVM/bridge/mockOVM_CrossDomainMessenger.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/test-helpers/Helper_ModifiableStorage.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 contract Helper_ModifiableStorage {

packages/contracts/contracts/test-helpers/Helper_PrecompileCaller.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 import { Helper_SimpleProxy } from "./Helper_SimpleProxy.sol";

packages/contracts/contracts/test-helpers/Helper_SimpleProxy.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 contract Helper_SimpleProxy {

packages/contracts/contracts/test-helpers/Helper_TestRunner.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/test-helpers/Mock_FraudVerifier.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 import { OVM_BondManager } from "./../optimistic-ethereum/OVM/verification/OVM_BondManager.sol";

packages/contracts/contracts/test-helpers/TestERC20.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 // a test ERC20 token with an open mint function

packages/contracts/contracts/test-libraries/codec/TestLib_OVMCodec.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/test-libraries/rlp/TestLib_RLPReader.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/test-libraries/rlp/TestLib_RLPWriter.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/test-libraries/trie/TestLib_MerkleTrie.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /* Library Imports */

packages/contracts/contracts/test-libraries/trie/TestLib_SecureMerkleTrie.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/test-libraries/utils/TestLib_Bytes32Utils.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /* Library Imports */

packages/contracts/contracts/test-libraries/utils/TestLib_BytesUtils.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/test-libraries/utils/TestLib_ECDSAUtils.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 
 /* Library Imports */

packages/contracts/contracts/test-libraries/utils/TestLib_EthUtils.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/test-libraries/utils/TestLib_MerkleUtils.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;
 

packages/contracts/contracts/test-libraries/utils/TestLib_RingBuffer.sol

-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.7.0;
 pragma experimental ABIEncoderV2;