Same thing applies to PCI. I can get USB specs for free from USB-IF. But the PCI and PCIe specs cost $4000 plus. Just so I can write my own PCI driver. Legally, I mean. Oh, there is external references, but what if I want the authoritative documentation? Should I have to pay thousands and thousands for access (!) to a standard that is ubiquitous in every sense of the word? There is, to me, a point at which ubiquity trumps any "IP rights" the standards org would have.