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    Protection against modification of web software


    I am a developer, mostly PHP, and I distribute my software freely, but each owner must still go through a very short registration process so I can keep track of who is using my software and where they're are using it, etc

    Does anyone have any ideas about how I can force someone to keep an original copy, rather than making modifications to it?

    For example, one package that I produced contains a conf file in it that stores a license number. While they can edit that conf file freely, I need to make sure that the license is valid. How could I connect to my database remotely to validate it? When do I connect?

    Any advice, please...
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    >> how I can force someone to keep an original copy

    Impossible to enforce that, unless you make a CGI script (written in PHP) and in binary form.

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