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programming a trial period

By lurla ·
I am tasked with coding a trial period into an existing java servlet. I have to use Java 1.1.8. As I understand it, this is generally done by saving an encrypted date to one or more files and then checking the date with current system date on each startup. After the trial period is over a product number must be entered or the product locks down.

Does this mean the acceptable product codes must be hardcoded into the program? How secure is an encrypted date/product code going to be using standard java libraries?

Is there more I'm not seeing? Anyone have experience or ideas where to look for help (including book recommendations or other good discussion boards or chat rooms)? I have found it incredibly difficult to find this sort of info on the internet. Any help is greatly appreciated.

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