Clarify "server" and "identifier" for auth redirects

[azaroth42]

http://iiif.io/api/auth/1.0/#tiered-access currently says:

If a server supports multiple tiers of access, then it MUST use a different identifier for each Description Resource and its corresponding Content Resource(s).

Which isn't really the requirement. There could be two servers, one of which has the protected full assets and a second server at a different domain with the public degraded versions. Then the "identifier" parameter doesn't necessarily change at all. Or different prefixes. The requirement is that the URI up to and including the identifier must be different.

[tomcrane]

Address in 2.0

[tomcrane]

Addressed in https://github.com/IIIF/api/pull/2115

Commit: https://github.com/IIIF/api/pull/2115/commits/f911383dfc241283b9997600fd876361959ee052

[zimeon]

Resolved with publication of Auth 2.0 https://iiif.io/api/auth/2.0/. The approach is now resource (URI) centric and there is more uniform description of different access controlled resources, without any mention of the identifier component of Image API services