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PO
 

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    <p>This is a social problem, not a technical one. You have copyright law on your side; no more should be needed. (Any and all technical solutions would be the equivalent of DRM, which is inherently ineffective.)</p> <p>Regarding your update: So basically you become a DRM supplier for this client of yours. So: Does the <em>client</em> understand that DRM is ineffective? Try educating them before wasting time on implementation.<br> If the client remains adamant, I'd take a long hard look at what current DRM vendors are doing. E.g. lots of handwaving, some obfuscation, and, erm... I don't know... what else do they do? Either way, you can be certain that any solution you implement will be undone in less than 10% of the time it took you to implement it - so spend as short an amount of time on this as you can get away with. (Before it was edited out, you wrote "It's in the spec" about "being sure that the system isn't sold on": this might mean you've agreed to build something which is technically impossible (you can never be <strong>sure</strong>), and would require you spending an infinite amount of time building something which comes close...)</p> <p>You might investigate having the application contact some central registry when run for the first time (with embedded fingerprint, different for each sale, so you know who passed on their code). That way your client can find out where the application is being run, and has a chance of contacting those who use it without permission. (Potentially turning them into new paying customers.) Maybe give said central repository the ability to send a kill-signal back? That gets <em>really</em> scary though, and liability concerns would be huge; avoid if at all possible.</p>
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    1. POHow to prevent resale of PHP source?
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    1. COI have not agreed to build this. That was more a hypothetical statement to get technical answers.
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