Strazdas said:
CD Project Red is a studio. It cannot be bought or sold without its owners permission, which is CDP.pl (yes the .pl is actually part of the name, silly companies). They are a local distributor of physical media as well as owners of GOG. CDProject Red owns 5% of CDP.pl stock, most likely as a capitalization stunt.
As a former employee of CDP.pl, let me step in and correct this:
CDP.pl is NOT the owner of CD Projekt Red. CD Projekt Red (as well as GOG.com and CD Projekt Red Finance) are part of CD Projekt S.A. company. CDP.pl used to be another branch of CD Projekt S.A. responsible for, as you said, distributing physical (and digital as of 2012) media in Poland. I said "used to" because in 2014, CDP.pl actually departed from the mother company and is now an entirely separate being.