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METHOD 1
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Re-build each Trial Version on a per-user basis encoding their volume serial key into the software for verification. Heavy effort on your side.
METHOD 2
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Each Trial Version is supplied with a user/pass combination verified by internet connection to your webserver on each reload.
METHOD 3
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Allow for x amount of submissions before ceasing to function. Each submission is first verified by unique ID (volume serial key) via your webserver (a small php application can handle this). Once it's hit the limit, function ceases.
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