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Message: [QUOTE="elloco999, post: 6747, member: 1467"] Hi, Most applications today have some form of activation, to protect it against illegal use (user didn't pay for it). Usually the user has to enter a key when installing the application. The key is then checked against some algorithm to see if it is a valid key. I was wondering how to implement something like this in my app. How do you generate these keys for the users, and how do you check them after the user enters them? Greets, El Loco [/QUOTE]