Lawrence Lessig on interoperability

At Creative Commons: Lawrence Lessig on Interoperability. Excerpt:

Why not add DRM to the rights expressed through Creative Commons DRE? What's wrong with a cheap system to enforce the rights still reserved?

There are two problems at least. We can see the first by returning to the picture of what made this network amazing — interoperability. Widespread DRM would disable that interoperability. Or at least, it would disable interoperability without permission first. We could remix, or add, or criticize, using digital content, only with the permission of the content controller. And that requirement of permission first would certainly disable a large part of the potential that the Internet could realize.

The second problem relates to "fair use." The law of copyright has never given copyright owners the right to perfect control over their copyrighted work. Fair use is a codified exception to that control. As we see them today, DRM technologies cannot respect "fair use."

I'm not sure that I agree. But it will be an interesting road ahead in the next two years.