How to implement registration mechanism in JavaME

I have my game in JavaME completed and ready to sell it. How do I implement registration mechanism so that only the user who paid can run my game?Thanks in advance

No answer? I guess the registration mechanism does not have to be JavaME specific. Can someone point me to a link/tutorial on how software registration is implemented? I found one link on Nokia forum where someone said that he would create a unique RMS record when the software runs the first time. After that, just check against this record. But I don't see how this will protect my software from being used by un-authenticated users?

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