License a dll

I have a dll i created before, i want to license it, i mean the user can't run or use it without this license.
He will download the application that contain this dll file then send me a number "his id", i make for him the license file and send to him to be able to run the application and can't share it with others.

Based on this idea i want you give me good examples about licensing a dll.


Thanks,
amrelgarhyAsked:
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amrelgarhyAuthor Commented:
Hello,
Your links was helpfull thanks.

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