A rather vague claim, needs more details. Canonical allow the use of the Ubuntu trademark to describe unmodified versions of Ubuntu (in this case, I'd guess it's their cloud server images)<p>If you modify the images, you can still redistribute them, you just can't call it Ubuntu.<p>This has some problems, some of which Matthew Garrett has explored in more details.<p>But generally, imo, it's a useful tool to prevent clueless vps/cloud providers modifying Ubuntu images and breaking them and tarnishing the Ubuntu name (which has happened repeatedly, usually breaking security).