Tarmack
Rhetorical Porcupine
Gretech is a Korean company that claim Starcraft video, they have the legit claim, but only in South Korea
Blizzard extends the same permissions for gamers to monetize on YouTube worldwide, so while Gretech may be a Korean company, that doesn't give them the right to claim other peoples content. Rather, this is a common negative issue relating to ContentID allowing mass claiming of content without content owner review being required prior.