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如果我们使用 GPL (v2) 涵盖的 CMS，如果我们对核心进行修改，是否必须重新发布 CMS 的源代码？
The GPL does not require you to release your modified version. You are free to make modifications and use them privately, without ever releasing them. This applies to organizations (including companies), too; an organization can make a modified version and use it internally without ever releasing it outside the organization.
But if you release the modified version to the public in some way, the GPL requires you to make the modified source code available to the program's users, under the GPL.
对我来说，这里的灰色区域是“如果您以某种方式向公众发布修改后的版本”的部分 - 向公众展示一个网站算作“向公众发布它”吗？
如果编写了与 CMS 集成的自定义插件怎么办 - 我们是否需要发布源代码？这算作修改吗？