Can WebM already be called an open standard?

[Timo Juhani Lindfors]

micu <micuintus at gmx.de> writes:
> But what would you say: Can criterion 4 (managed and further developed 
> independently of any single vendor in aw process open to the equal 
> participation of competitors and third parties) already be identified to 
> be true?

Before we start to evaluate new formats I think we should first go
through existing and well known formats to get some sort of
baseline. Is PDF an open standard? What about ZIP? etc.