[derf_]

>If a single bug makes you liable, obviously it is unfair, etc, but that's exactly where the details of the license come into play - I am not a lawyer, so I have no idea if the terms here are reasonable or not.

Speaking as one of the authors of the spec here, this is very much not the intention. I personally believe a patent license should never be used to enforce standards compliance, and that's not the purpose of that term. Keep in mind, I don't think anyone involved in this standard wants to go around suing people, particularly those interested in implementing and deploying it! In addition to being a gigantic waste of time and money, it would kill the standard dead.

But we specifically included a conformance test to make it easy to know if you met the legal requirements, so you didn't have to trust us. At the request of the working group, this test was made so lax that we worried you could start deleting random lines of code (as an "optimization") and still manage to pass it (to combat this the test also displays a "quality" parameter which drops long before you get to the failure point, so implementors can start marketing that number if their competitors try this tactic, instead of being stuck in a race to the bottom).