Based on jukki's post:
Nzp is using a heavily modified quake engine called proquake. This engine is made by baker. and we have editted it to suit our needs.
So what is required is for you guys to release the modified sources of proquake.
My understanding is that qc was entirely made by you and does not need to be open sourced.
we DO need to release the engine source... but I currently don't have it.
blubswillrule: your team have 48h to come clear on this matter, by putting the necessary source (your edited source of proquake) in a location that is easy enough to retrieve. Jukki's post in the submissions subforum should contain a link to these modified sources of baker's engine. If you can't have that done in the next 48h we'll have to remove your entry from the contest
(and I think 48h is fair since you guys released the binary almost a month ago, so technically you already had a month to do it!)
As I said above, my current understanding is that besided the engine itself, you do not need to open source anything else.
Based on what I've seen, I'm convinced this is just a misunderstanding, and I'm sure this will be solved soon.