Estoppel. The development process was highly publicized and the relevant entities surely knew about the call for patent claims.
And possibly laches. Patents are highly dependent on the technological context of when they're written. The Opus development process deliberately sought to avoid existing patents, and trying to reverse these judgements a decade later is disingenuous.
And possibly laches. Patents are highly dependent on the technological context of when they're written. The Opus development process deliberately sought to avoid existing patents, and trying to reverse these judgements a decade later is disingenuous.