Just preventing Piracy (Very usual in Mexico).
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>Then, if another user try to start, with the same username and other serial, both wil be disconnected and the username erase from the database. What we want, it´s detect who allows piracy of our software. Of course, the user that buys our software, needs to call us to re-active his account.
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>I hope you can understand the whole idea, and tell me what you think about it. Maybe there´s another way for this.

Hi,

I understand your goal. Why not using cookies??

If your customer has to contact you to re-activate his account, then I've found a way to teease my friends ;-)

Lasse