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By contributing to LenMus langtool through pull-requests, comments, or otherwise, you accept to release your contribution to the license terms as described in the LICENSE.
LenMus langtool uses a shared copyright model: each contributor holds copyright over their contributions. The project versioning records all such contribution and copyright details. If a contributor wants to further mark their specific copyright on a particular contribution, they should indicate their copyright solely in the commit message of the change when it is committed.