I hardly think it's true that CSS was "broken by Norwegian teenagers in an afternoon"!

As I heard the story, CSS was initially broken by means of reverse engineering a software DVD player (Xing) to extract the key that was built into the software. Every DVD manufacturer, software or hardware, has its own unique key that it builds into the player and will be used to decrypt the DVD data.

Once they got the key and the CSS decryption algorithm (which was secret) out of the Xing DVD software, cryptographers were able to detect weaknesses in CSS. Using these weaknesses it became possible to decrypt any disk, even without the stolen key. That is what led to deCSS and the many DVD ripping programs which exist today.

The process went through several steps and took some time. The algorithm was not cracked by teenagers in an afternoon.