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I have a PDF file I want to sell for a limited period, i.e. you use it for 30 days and then it turns into a pumpkin or become otherwise unreadable. The medium is PDF.
This would be like a shareware program that becomes unusable after a trial period. Is this realistic? Obviously anyone who really wants to copy the material will do it. They can retype it from the screen if they're so inclined. In any case I'd like to hear from anyone who has implemented or considered implementing what I describe above, whether with PDF or not.
