: This tells you the source. Unlike a "CAM" (recorded in a theater), an HDRip is usually taken from a high-definition digital stream.
: This identifies the "codec." HEVC (High-Efficiency Video Coding) allows for high-definition video at much smaller file sizes than older formats. : This tells you the source
: These are "release groups" or site stamps. Think of them as the digital signatures of the people who encoded and uploaded the file. : This tells you the source