我们非常喜欢 MIT 许可协议，尤其是它的简洁性，使其成为小型软件项目的完美选择。
然而，随着 PSONO 的不断发展，我们花时间查阅了其他与 MIT 兼容、但能更好保护贡献者的开源许可证。因此，我们将在下一个版本中切换到 Apache 协议。
官方文档已经反映了这一变化。所有对 Psono 的贡献将遵循以下授权：
Copyright 2017 Sascha Pfeiffer
Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
此外，我们还增加了“开发者来源证明”（DCO），在 Linux 内核社区可能比较熟悉，这也是贡献的要求之一。
Developer Certificate of Origin Version 1.1
Copyright (C) 2004, 2006 The Linux Foundation and its contributors. 1 Letterman Drive Suite D4700 San Francisco, CA, 94129
Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
Developer’s Certificate of Origin 1.1
By making a contribution to this project, I certify that:
(a) The contribution was created in whole or in part by me and I have the right to submit it under the open source license indicated in the file; or
(b) The contribution is based upon previous work that, to the best of my knowledge, is covered under an appropriate open source license and I have the right under that license to submit that work with modifications, whether created in whole or in part by me, under the same open source license (unless I am permitted to submit under a different license), as indicated in the file; or
(c) The contribution was provided directly to me by some other person who certified (a), (b) or (c) and I have not modified it.
(d) I understand and agree that this project and the contribution are public and that a record of the contribution (including all personal information I submit with it, including my sign-off) is maintained indefinitely and may be redistributed consistent with this project or the open source license(s) involved.
每个提交（commit）必须包含如下形式的 DCO：
Signed-off-by: Joe Smith
项目要求使用您的真实姓名。匿名贡献者或使用化名的贡献均不被接受。
请在 git 配置中设置您的 user.name 和 user.email，然后在每次提交时务必使用 -s 或 --signoff 标志，以在提交信息末尾添加“Signed-off-by”行。
