09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0
This number is the key to being able to do what you want with HD-DVD discs that you payed money for.
The movie industry is suing people over this number.
It is an important number, because in can almost be said to be synonymous with Freedom.
Keeping in mind that this number can and will soon be obsolete, a statement must be made that the freedom of consumers to do what they want with stuff that they pay for, can not, must not be taken away.
More information at the link.
update: an even better crack is now available
On Google.