What is DRM really good for

http://library.duke.edu/blogs/scholcomm/2009/01/10/what-is-drm-really-good-for/

If DRM systems really are being used primarily to suppress competition and prevent innovation, they are working directly in opposition to the fundamental purpose of copyright law they were sold to us to support. Read together, these two reports suggest that tinkering with exceptions, as the Library of Congress is charged to do every three years, is not enough; instead, the value of the whole idea of providing legal protection to DRM should be reexamined.