HD-DVDs are protected using a system known as AACS. In order for someone to bypass AACS and make a copy of a disc, a 16 digit hexidecimal code must be first known.
When the code was first discovered, it was posted on Digg. It was quickly removed by the Digg staff, which very quickly caused a huge revolt. Users posted the number hundreds of times on Digg, while the Digg staff kept trying to delete those entries as quickly as they could.
As a result of them trying to keep the number quiet, it became huge. As of right now there are 857,000 pages in Google with the number, along with a few domain names and even a song about it.
09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0
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