I still don't like that definition, since it confuses the vast majority of multimedia formats with formats that are actually proprietary. I prefer to reserve t

I still don't like that definition, since it confuses the vast majority of multimedia formats with formats that are actually proprietary. I prefer to reserve the word proprietary for formats where the specification is either secret or does not exist and any free implementations were reverse-engineered, e.g. RealVideo, Windows Media Audio, and so forth. It doesn't make sense IMO to simply call 98% of everything proprietary; it sort of weakens the meaning of the word to overuse it as such.