Yet another demonstration of the folly of purchasing DRMed media. Why subject your ability to read your books to the possibility of bizarre, irrelevant problems

Yet another demonstration of the folly of purchasing DRMed media. Why subject your ability to read your books to the possibility of bizarre, irrelevant problems like this? It's like O'Reilly had a falling-out with Barnes & Noble and suddenly I can't read a book that's been sitting on my shelf for a year. Is the convenience really worth it?