Rights over maps?

[Mr-Fusion]

So i was reading another extremely intellectually stimulating thread at steampowered http://www.steampowered.com/forums/showthread.php?s=&threadid=206750&perpage=15&pagenumber=1
and did indeed start to wonder why maps like Inferno and Train haven't been converted for source despite being far more popular than the likes of Havana and Piranesi (accoring to 1.6 player numbers).

Are there intellectual property rights issues regarding these maps because i can't understand why more popular maps wouldn't be converted first?

 

[Nudger]

It could be that Valve want to see how things like the removal of the CT Shield or the new way to detect enemies using shadows affect certain maps. Doubtless to say they're probably working on a few more for the next couple of months.

I hope to god they do CS_Militia next.