[OpenID] OpenID license

[Nathan]

Hi,

I'm trying to find what license the following spec's are released under:

OpenID Authentication 2.0
OpenID Attribute Exchange 1.0
OpenID Provider Authentication Policy Extension 1.0
OpenID Authentication 1.1
OpenID Simple Registration Extension 1.0

I've searched them all for any mention of license, patent, royalty and 
similar and found nothing at all?

Are the spec's and technologies all completely public domain, if not 
which license(s) are they covered by?

Thanks in advance,

Nathan