As kooky as I thought he was, Stallman seems to be more prophetic each year. His essay The Right to Read seems to be a vision of how knowledge gets locked down. Every American college/university student has been trapped into renting textbooks. Elsevier and Pearson seem to have used that essay as a roadmap.

https://web.cs.ucdavis.edu/~rogaway/classes/188/materials/st...

I think he's wrong that DRM violates the 4th Amendment, I contend that it is - first and foremost - a violation of the 3rd Amendment.