MIT License

Copyright (c) 2026 品源（Pinyuan）

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适用范围（**请务必先读这一段**）
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本许可**仅**覆盖以下「协议与实现参考」材料：

    * docs/PROTOCOL.md      协议规范
    * docs/COMPATIBILITY.md 兼容性承诺
    * tools/pyclient.py     消费侧参考实现
    * tools/conformance.py  一致性测试套件
    * tools/README.md       说明
    * tools/test-pyclient.py 参考实现的测试

**不覆盖** `server/`（品源数据库服务端本体）及仓库内其他一切内容。
服务端是产品，其授权方式由权利人另行决定，本文件不构成对其的任何许可。

目的：**允许任何人免费实现兼容的客户端或服务端**，包括商业用途，
无需授权、无需署名、无需回报。协议要成为事实标准，实现必须零门槛。

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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.