License data is stored on an otherwise unreadable part of the disk. The firmware allows and instructs the disk drive on how to access and read that license. I’ve seen the license printed on the edge of the center hole for some disks. You can’t write that with standard burners. You can read it though, especially if you designed the head to move all the way to the inner edge. There isn’t one specific way however, some we prob don’t know about that are kept if others are discovered and exploited.
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