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If it's truly limited to the subnet, I don't see it as a big deal. They're apparently just using it to make sure that you're not running their software on more than one machine at a time.
 
I can understand the whole piracy thing and preventing anyone from running the app on more than one box at a time, but I guess I'm just wondering what they're sending. According to the article, one bit of the info is your mac's serial number.. anyone know if Adobe or anyone else do that unencrypted?
 
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