Licensing of freemium plugin

Disclaimer: I am not a lawyer.

The issue here is the Apache license. You are free to distribute your own work under as many license varients as you want. After all you retain copyright. But if you include other peoples work in the distribution, every license varient you distribute under needs to be compatible.

However, the Apache license is actually pretty permissive and allows you to distribute its code within commercial products. So long as the Apache licensed part of the code is still marked as Apache licensed, you are free to use it in commercial and proprietary systems.

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