This is complicated but Ed Felten’s post is worth the effort. It’s about the content industries’ submission to the US Copyright Office (which is currently pondering the question of what should be exempted from the DMCA). You really need to read the entire post, but here’s the nub of it:

In order to protect their ability to deploy this dangerous DRM, they want the Copyright Office to withhold from users permission to uninstall DRM software that actually does threaten critical infrastructure and endanger lives.

I’ve always thought that the arrogance and stupidity of the copyright thugs was extraordinary, but this really takes the biscuit.