Seeing this article over at Wired (Public Libraries, Private DRM) reminded me of a cool thing you can do to help accelerate the downfall of civilization:

• Invent a DRM scheme with revocation (naturally, most of the ones coming out, such as AACS, have this).
• Get useful content recorded with your scheme, then into libraries, through the force of the marketplace.
• Let people go on thinking that libraries are a way to preserve cultural content beyond its life in the market and outside of the hands of future censors.
• Revoke, revoke, revoke! The content magically disappears off library shelves (given that devices can no longer read the content, ever again).
• Instead of revoking explicitly, you can also go out of business, release a new and incompatible version of your DRM scheme, have a bug in your DRM, let your servers go down, etc. The possibilities are wide open.