The only rule that Richard, the site owner, stipulated here is that absolutely no officially released stuff be uploaded here. That includes stuff released on any format (vinyl, cassette, video, laser disc, dvd (probably including audio ripped from the dvd as well), dvda, etc).
If the stuff you want to upload is genuinely unofficial then there shouldnt be a problem.
Martin's site is one of many excellent sites for information if you are not entirely sure what is official or not. Heres the info on Rio http://www.queenconcerts.com/official-releases/live-in-rio-1985.html
Hope that helps in some way.
"Normally i can't dance to save my life.
But as soon as I step in dog shit, I can moonwalk better than Michael Jackson."