add LICENSE and make associated changes (Uniswap#433)

* first pass

* make NoDelegateCall not GPL

* make tick math GPL

* reorder files to clearly indicate licensing

* make liquidity math gpl

* credit remco

* flatten folders again, make README clearer

* add governance rights to license

* add LICENSE reference to README

Co-authored-by: Moody Salem <[email protected]>

LICENSE

@@ -0,0 +1,100 @@
+Business Source License 1.1
+
+License text copyright (c) 2017 MariaDB Corporation Ab, All Rights Reserved.
+"Business Source License" is a trademark of MariaDB Corporation Ab.
+
+-----------------------------------------------------------------------------
+
+Parameters
+
+Licensor:             Uniswap Labs
+
+Licensed Work:        Uniswap V3 Core
+                      The Licensed Work is (c) 2021 Uniswap Labs
+
+Additional Use Grant: Any uses listed and defined at
+                      v3-core-license-grants.uniswap.eth
+
+Change Date:          The earlier of 2023-04-01 or a date specified at
+                      v3-core-license-date.uniswap.eth
+
+Change License:       GNU General Public License v2.0 or later
+
+-----------------------------------------------------------------------------
+
+Terms
+
+The Licensor hereby grants you the right to copy, modify, create derivative
+works, redistribute, and make non-production use of the Licensed Work. The
+Licensor may make an Additional Use Grant, above, permitting limited
+production use.
+
+Effective on the Change Date, or the fourth anniversary of the first publicly
+available distribution of a specific version of the Licensed Work under this
+License, whichever comes first, the Licensor hereby grants you rights under
+the terms of the Change License, and the rights granted in the paragraph
+above terminate.
+
+If your use of the Licensed Work does not comply with the requirements
+currently in effect as described in this License, you must purchase a
+commercial license from the Licensor, its affiliated entities, or authorized
+resellers, or you must refrain from using the Licensed Work.
+
+All copies of the original and modified Licensed Work, and derivative works
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+of the Licensed Work. If you receive the Licensed Work in original or
+modified form from a third party, the terms and conditions set forth in this
+License apply to your use of that work.
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+terminate your rights under this License for the current and all other
+versions of the Licensed Work.
+
+This License does not grant you any right in any trademark or logo of
+Licensor or its affiliates (provided that you may use a trademark or logo of
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+TO THE EXTENT PERMITTED BY APPLICABLE LAW, THE LICENSED WORK IS PROVIDED ON
+AN "AS IS" BASIS. LICENSOR HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS,
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+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, AND
+TITLE.
+
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+your works, and to refer to it using the trademark "Business Source License",
+as long as you comply with the Covenants of Licensor below.
+
+-----------------------------------------------------------------------------
+
+Covenants of Licensor
+
+In consideration of the right to use this License’s text and the "Business
+Source License" name and trademark, Licensor covenants to MariaDB, and to all
+other recipients of the licensed work to be provided by Licensor:
+
+1. To specify as the Change License the GPL Version 2.0 or any later version,
+   or a license that is compatible with GPL Version 2.0 or a later version,
+   where "compatible" means that software provided under the Change License can
+   be included in a program with software provided under GPL Version 2.0 or a
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+
+-----------------------------------------------------------------------------
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+The Business Source License (this document, or the "License") is not an Open
+Source license. However, the Licensed Work will eventually be made available
+under an Open Source License, as stated in this License.

README.md

@@ -1,5 +1,3 @@
-# ⚠️ STRICTLY CONFIDENTIAL RESEARCH ⚠️
-
 # Uniswap V3
 
 [![Lint](https://github.com/Uniswap/uniswap-v3-core/actions/workflows/lint.yml/badge.svg)](https://github.com/Uniswap/uniswap-v3-core/actions/workflows/lint.yml)
@@ -49,3 +47,14 @@ contract MyContract {
 }
 
 ```
+
+## Licensing
+
+The primary license for Uniswap V3 Core is the Business Source License 1.1 (`BUSL-1.1`), see `LICENSE`.
+
+### Exceptions
+
+- All files in `contracts/interfaces/` are licensed under `GPL-2.0-or-later` (as indicated in their SPDX headers), see `contracts/interfaces/LICENSE`
+- Several files in `contracts/libraries/` are licensed under `GPL-2.0-or-later` (as indicated in their SPDX headers), see `contracts/libraries/LICENSE_GPL`
+- `contracts/libraries/FullMath.sol` is licensed under `MIT` (as indicated in its SPDX header), see `contracts/libraries/LICENSE_MIT`
+- All files in `contracts/test` remain unlicensed.

contracts/NoDelegateCall.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: BUSL-1.1
 pragma solidity =0.7.6;
 
 /// @title Prevents delegatecall to a contract

contracts/UniswapV3Factory.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: BUSL-1.1
 pragma solidity =0.7.6;
 
 import './interfaces/IUniswapV3Factory.sol';

contracts/UniswapV3Pool.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: BUSL-1.1
 pragma solidity =0.7.6;
 
 import './interfaces/IUniswapV3Pool.sol';

contracts/UniswapV3PoolDeployer.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: BUSL-1.1
 pragma solidity =0.7.6;
 
 import './interfaces/IUniswapV3PoolDeployer.sol';

contracts/interfaces/IERC20Minimal.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: GPL-2.0-or-later
 pragma solidity >=0.5.0;
 
 /// @title Minimal ERC20 interface for Uniswap

contracts/interfaces/IUniswapV3Factory.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: GPL-2.0-or-later
 pragma solidity >=0.5.0;
 
 /// @title The interface for the Uniswap V3 Factory

contracts/interfaces/IUniswapV3Pool.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: GPL-2.0-or-later
 pragma solidity >=0.5.0;
 
 import './pool/IUniswapV3PoolImmutables.sol';

contracts/interfaces/IUniswapV3PoolDeployer.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: GPL-2.0-or-later
 pragma solidity >=0.5.0;
 
 /// @title An interface for a contract that is capable of deploying Uniswap V3 Pools