IBM's Purple Book and Open Source

Bill Kendrick writes: "I noticed a ZDNet article titled "Why we should hail IBM's ode to open source--the Purple Book". It compares IBM's open release of the classic PC's hardware and BIOS specifications with today's OpenSource model and Linux." Shortly after IBM's open-spec PC, they reverted to the closed PS/2 with a patented bus in an attempt to monopolize the exploding market. Hopefully this particular bit of history won't replay itself.