With all due respect, Mr. Perens, I believe it is important to point out that you worked for Pixar for a long while. This film producer just released the Disney "UP" blockbuster which is doubtlessly being downloaded, without permission, by tens-of-thousands bittorrent clients at this moment. Your view that the lack of DRM spells end-times for Linux may be shaded by past experiences.
As long as there is open access to the network, there will be sufficient media available, with a permissive copyright license for unrestricted duplication. Enough for lifetimes of text, music, and videos. If that means being locked out of the latest 90 minute animated video, then it may be a sacrifice that some will choose for their freedoms.