Historical Chess MIT notice This is the license previously distributed with Chess, including revision 131a23e. Rights validly granted for those copies and covered portions remain effective. This historical notice is not a new MIT grant for later original contributions governed by the current proprietary LICENSE. MIT License Copyright (c) 2026 Chess contributors This license covers the original Chess code, scripts, models, materials, icon, synthesized sounds and original documentation in this project. Third-party engine components and system fonts retain their own licenses. Lichess puzzle source data retains its CC0 1.0 dedication; see legal/LICHESS_PUZZLES_CC0.txt. Original CHESS layout adaptations and tooling are covered by this project's MIT license. 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.