how to Prevent the Software from Multiple Installations

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Hi
I have Developed a software with vb.net and ms access as db know i hv to give to one of my friend to try but am afraid he will give to multiple people and they will use it.

how can i prevent my software not be installed on any computer with out my permission

i hv seen some software where they can only install once after that they cant.

plz tell me how can i do like this plzzzzzzzzzzzzzz

Regards
Adnan

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