90 9F 11 20 9D 63 D4 5B C7 42 56 C5 63 56 88 C0

You might see a Hexadecimal number somewhat similar to this:

90 9F 11 20 9D 63 D4 5B C7 42 56 C5 63 56 88 C0

popping up on the internet.

It's the encryption key for HD-DVD players.

"90 9F 11 20 9D 63 D4 5B C7 42 56 C5 63 56 88 C0" ... isn't actually the key, because sites are being taken down for publishing it, despite the fact that there is no way of protecting a number or string. But anyway, I don't want Google to block my blog.

The whole exercise demonstrates the futility of trying to block access to media. If you can access the hardware (and we all have to in order to play the stupid video or music), you can break ANY encryption. That's just the way it is.

It's all just maths!!