DRM sucks redux: Microsoft to nuke MSN Music DRM keys
http://arstechnica.com/news.ars/post/20080422-drm-sucks-redux-microsoft-to-nuke-msn-music-drm-keys.html
"Companies that control various DRM schemes, as well as the content providers themselves, can yank your ability to play the content which you lawfully purchased (and now, videos) at any moment—no matter what your expectation was when you bought it."