Validating licenses when importing DLL's with MEF, .NET C#

erik schouten asked:

I need advice on how to design a licensing system when I am importing DLL files using the MEF. So, my program would run and on startup would begin to load all the DLL's from a specific map into the program. First of, I want to make sure that the program would only load DLL's that are allowed by me, so let's say the original set of DLL's.
Other people can buy a license to also make these DLL's. So there must also be a way to validate this.

What I have tried:

I have absolutely 0 experience on the licensing topic. I have read a lot of articles but nothing really seems to fit my problem.

Tags: C#, .NET, Licensing, MEF

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