PDF linking to a single computer/user

I create and sell interactive PDF documents to my subscribers. I encrypt all of my PDF files with passwords that only subscribers will receive once they have made the payment. But recently, I discovered that some of my subscribers have been emailing PDF files with passwords to other subscribers, so that they can have access to my documents without payment.

Is there a way to link a pdf file to a single computer or user?

Otherwise, is there any suggestions on how to counter this program?

You need a DRM solution for that, like Adobe LiveCycle. It is expensive, so you'll have to decide if your volume warrants.

Tags: Acrobat

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