It is unfortunate that is what you need to do, because there really is no satisfactory way to give others access to their own copy of your program and enforce a license restriction on it. This is especially true when you provide the source to them.

There are some possible workarounds. None of them are pleasant. What's worse is that the workarounds for making your Perl code more secure on a server you don't control still don't make rejecting a license or ending a subscription foolproof as a technical measure. Even a compiled program that decrypts most of itself at run time can be broken by a motivated person with knowledge of readily available tools.

The only reliable way to enforce subscriptions is to control where the code runs. You can do that by running it on your own server and selling access to it or by enforcing the subscription in a reliable and responsive court system. The latter is often more trouble than it is worth.

In reply to Re^3: License key for script by mr_mischief
in thread License key for script by shanu_040

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