gracken (Ecuador)
Protect Copyrighted CDs/DVDs
CDs and DVDs that have a small re-writable part to write serial numbers for each customer, you could even make that a critical component of the program that would be encrypted. You could decrypt the CD/DVD with the serial number. This could also be incorporated to prevent unauthorized copying, which can be done with that current discs with many different programs.

Reward: one please

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