How do I copy-protect my Java application?

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I want to sell my Java application using PayPal. When a payment is received, the customer is mailed a one-time download link to my application.

My question is, how do I prevent people from sending the .jar file to their friends/uploading it on the internet?

Obviously I need some kind of check in the application which only allows it to run on one computer. And that's another problem, I don't want a customer to have limitations on one computer, they should be able to run it at home and work etc.

Maybe some kind of cd-key would do the trick? Is there any cd-key resources for Java out there? Or should i build my own algorithm? Here comes yet another problem, reverse engineering..

Please help me solve this :)

cracking copy-protection reverse-engineering licensing java
6 Answers

In my old c++ days i get in arms to front the piracy using MAC Address code protection, very nice and really no body stole my software uppone the mac address protection because i always force the OS to re-read the real mac avoiding mac overrides. That was on C++ coding having direct access to local resources.

thats not the case today, nither in java applications in which the code is located in .class files that can always being decoded back to the original source code (yes it is possible, and very easy to find tools to do so).

i think, as resume, it is impossible to protect java programs agains piracy. i find no way like the old golden c++ days :)

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