Licensing generator/validator program [closed]

Posted by AtoMerZ on Programmers See other posts from Programmers or by AtoMerZ
Published on 2012-11-12T11:49:12Z Indexed on 2012/11/12 17:19 UTC
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licensing

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validation

I need to write a program that generates/validates license for users of my application.
The application has a number of features each of which can be purchased by the user. Also each feature can be enabled in trial mode. Meaning only for a specified duration of time.
Before I actually try to write the code myself, I'm wondering if there are any free/commercial programs similar to what I'm looking for.

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