Here are copies of some CSS related posts to the Livid mailing list
Most of these are now unavailable from the archives, so I mirror them here.

Anonymous post of CSS C source

Post describing 216 attack on streamcipher (Date: Wed, 27 Oct 1999). Source.

Post describing attack on playerkeys (Date: Thu, 28 Oct 1999). Source.

Post describing attack on Disk key hash (Date: Sat, 30 Oct 1999). Source.

CSS decoder.