"Also, I can certainly create audio CDs without ever purchasing the Red Book. Copyright only protects the book itself, not the knowledge it contains. That knowledge can be gotten legally in any number of ways, including simply reading the source of a program which implements CD audio creation."
Except those programs are copyrighted, too, as was Compaq's clone BIOS. They made a CLONE of IBM's BIOS that happened to be feature-exact. That was the basis for the "clean room" defense. But note that Google apparently copied Sun/Oracle's Java header code down to the errata, which in a proper clean-room effort wouldn't have been encountered or copied in.