But beyond perhaps some logo usage rules or guidelines, the existence of the format spec isn't necessarily the word of god, so to speak.
Sony has been implementing intentional errors in their DVDs for many years. On the one hand it likely has increased the annoyance factor in ripping those DVDs and therefore somewhat decreased the prevalence of ripping, but on the other hand you have cases like the OP where the standard use case is also hindered to the level of annoyance.