On Kickass torrent, movies are organized as 1080p/720p/bluray, etc... Whats the difference between 720p & bluray on kickass? I mean isn't 720p & bluray same & vice versa? And some 720p bluray movies appear in DVDRIP & unknown section. When I check the movies details, they are mostly same i.e format/codecs, etc... so why they appear in DVDRIP & not in 720p section? The uploaders uploads movies in those section or the site analyzes & organizes them?