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i want to register my application when it first time runs. it will ask a serial number and 16 digit key after entering correct key it will register. when next time i run the application it will not ask me a register key. i want the code in vb6

+1  A: 

You might check out Activelock. It's an open-source software licensing/copy protection system. According to the site:

ActiveLock is a "totally" free COM DLL created to help you to:

  • Add registration features,
  • Protect your programs from piracy
  • Sell your programs online!
  • ActiveLock is powerful, flexible and 100% royalty-free.

Another option, if you insist on VB6 code is WLock-Licensing.

C-Pound Guru
Important to note that it uses the BSD licence, which has no "copyleft" and allows linking from code with a different licence. I wouldn't put it past someone to create an open source copy-protection system with a "viral" licence like GPL :)
MarkJ