Players must be licensed to work under the DVD CSS encryption scheme. The DCMA makes cracking the scheme a crime, so it's illegal for users to copy legally-purchased content in another format for personal use, as the fair use exception allows. This would not be a problem if the CSS encryption scheme could be used in a targeted manner to prevent piracy, but it can't. It can only be used to restrict access to the material, wherein lies a can of worms threatening consumers' rights of fair use, and potentially yielding to the industry a weapon which it can abuse in a number of ways. In order to license DVD CSS, you've got to agree to the industry's terms.
Access controls are too general.
A Monopoly in the Making Controlling access to content via encryption and specially licensed players is a sloppy substitute for copyright protection with side effects reaching far beyond the simple matter of deterring piracy. It means, for example, that users are unable to make their own home-movie DVDs and watch them on a standard player. More importantly, it means that independent filmmakers who might wish to release their work in DVD format will be unable to produce work viewable on standard players without first obtaining the required industry licenses. The DCMA gives the movie industry power to control film distribution, which it is free to abuse secure under the aegis of a law purporting to protect its copyrights. He would have to crack the DVD CSS crypto scheme so that consumers could view his work on their standard, licensed players.