Lenses listed in Group A, Group B, Group C... Why?

[Marsu42]

I think the "Referral Denied" means you can not access the pdf directly from a link on the Canon Rumors forum since it is not an official Canon site (it is checking what site you are accessing the link from -- the referring site).

... or use something like the "RefControl" Firefox plugin which has a config option to always tell sites that it originates from the same site, circumvents a lot of cross-domain referer checks. It has a whitelist, too so you can except sites that need the real referer.

With this setup, the download of said pdf works just fine