I know that many people may interpret open access as 'free to read', but I'm not sure that building that into a signalling system in Wikipedia is the best idea. I've not totally thought this through yet, and I realise that it's quite a complex set of degrees of openness which you've managed to condense into three symbols well. But how about just using the PLOS signals in their 'how open is it' guide, i.e. the orange 'lock' logo for open access and the orange lock but with a cross through it for closed access?
* orange padlock for "open access" ("CC-BY", "CC-BY-SA", and perhaps also more restrictive CC licenses)
* crossed-out orange padlock for "closed access"
This wouldn't signal free to read content that has no re-use rights, but then I don't think this type of content has anything to do with true open access according to the standard definitions (Budapest etc.).
I also think we maybe don't need to take embargos into account. At the end of an embargo date, a majority of articles are still not open access. The process of an article becoming open access at the end of an embargo is not usually automatic but relies on them actually being deposited in a repository. For this reason I think it would be misleading to mark up articles in Wikipedia with a symbol that makes reference to embargo dates, because there is no way of knowing whether the *potential* for open access is achieved on this date.
Just some thoughts.
Thanks,
Stuart
User:Lawsonstu