Hello,
你好，
The work you create with Spine belongs to you, so it is up to you to autorize the usage of it by a third party.
您使用Spine创建的作品属于您，因此您可以自行决定由第三方授权使用它。
If perhaps you are asking about the usage of Spine by a company you made work for, this blog post should explain it well:
如果您正在询问工作所在的公司对Spine的使用情况，则此博客文章应对此做一个很好的解释：
Blog: 新许可协议阐释
