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=== Volume IDs ===
Volume IDs are unique identifiers or [[serial number]]s that are stored on pre-recorded discs with special hardware. They cannot be duplicated on consumers' [[Blu-ray Disc recordable|recordable media]]. The point of this is to prevent simple bit-by-bit copies, since the Volume ID is required (though not sufficient) for decoding content. On Blu-ray discs, the Volume ID is stored in the [[ROM-Mark|BD-ROM Mark]].<ref>{{cite web |url=http://www.aacsla.com/specifications/AACS_Spec_BD_Prerecorded_0.912.pdf |title=Blu-ray Disc Pre-recorded Book |access-date=1 November 2007 |date=27 July 2006 |publisher=AACS LA |page=15 |archive-url=https://web.archive.org/web/20071106065659/http://www.aacsla.com/specifications/AACS_Spec_BD_Prerecorded_0.912.pdf |archive-date=6 November 2007 |url-status=dead}}</ref>
To read the Volume ID, a cryptographic [[Public key certificate|certificate]] (the ''Private Host Key'') signed by the AACS LA is required. However, this has been circumvented by modifying the firmware of some HD DVD and Blu-ray drives.<ref name=arstechnica-aacs>{{cite web
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