I'm trying to wrap my head around OpenID and OAuth.
From what I understand, OpenID only says that you are a user of the OpenID provider. So if I log into a site using an OpenID, all it will return is "yes, this person is a user of X site."
If I want to retrieve a users email address, I would need an authorization as well, which is where OAuth comes in.
All that being said, does this imply that if an OpenID username is an email address, there is no way to retrieve that information without OAuth as well?