Is it allowed to host Quake Live maps here? I mean made specifically for Quake Live (so BSP is version 47 and such unplayable in regular Quake 3). This is the case of this map. Since I do not have Steam account and I do not have a copy of Quake Live, I can't test this map right now, maybe some years laters, if nobody gives in review during the QL idle time :( But as one would expect, it would be Quake 3 map and then he loads it up in Quake 3 and gets BSP version mismatch error. So good I check pk3 content first, so I could predict results of loading such maps...
Quake Live maps made for Quake Live available on the Workshop can stay on the workshop
Players of Quake Live would find downloading a map for Quake Live from ..:LvL manually and expecting their players to also download would be very annoyed and the process is cumbersome. There would be no real benefit to host Quake Live maps here.
Scope creep is bad
And don't even think about submitting conversions of QL maps to Q3 against authors' wishes. It's bad enough QL is recieving too much of the versa (disguised as "Race maps" etc)
Edited 1.78 minutes after the original posting.
Yes, a conversion of any kind where the original map is used and modified in some way is a copyright issue unless you are the owner of the original or have been granted permission by the owner.
A remake on the other hand is a very grey area and I do not want to comment on that at all.
As for conversions: Like Tig says. You need permission to convert someone's map to another game (or modification). That way I was able to do conversion of Opposing Force map by PaN61 into Team Arena version (Opposing Teams). You should NEVER do conversion, if you don't have permission to do that. That in fact doesn't apply to id's maps delivered with GtkRadiant as sample maps. Unfortunately, not all mappers are so honest and id seems to be focused mainly on Quake Champions development rather than keeping an eye on unauthorised modifications and redistribuion of Quake 3 Arena contents. If they did, mostly half of the beginner public mapping attempts would be soon banned and removed from download sites...