GTA developer Rockstar's parent company, Take-Two Interactive, is issuing takedown notices for GTA map mods.
"Just to make sure as many people here know as possible, Take-Two have been going heavy with the DMCAs this week, first starting with GTAV map mods like GTA3 Portland, Vice City Overhaul, etc," writes Ash_735 on the official GTA Forums (thanks, PC Gamer).
As Ash puts it, an agreement to help the publisher and the modding community peacefully coexist was struck a little while back when Take-Two "tried to make modding GTA games illegal".