Policy on Licenses and Clones

There are any number of licenses you can pick for a plugin. GPL amongst others allows other people to copy and redistribute your code under certain conditions. Most noticeably the requirement that any fork also be GPL. Other open source licenses have other requirements.

If you pick the GPL license or any other open source license for your plugin and someone clones your plugin it is not a copyright violation as long as they follow the requirements.

As it pertains to plugins uploaded to...

Policy on Licenses and Clones