This denotes the source and quality of the video. It means the file was compressed and encoded from an official commercial DVD, a dominant standard before high-definition streaming and Blu-ray became ubiquitous.
If you extract an archive like this, you will rarely find a video file. Instead, you are likely to encounter: 1. Double Extensions (Trojan Horses) Paranormal.Activity.A.Hardcore.Parody.XXX.DVDRip..zip
The Streaming Revolution and the Death of the "Watercooler Moment" This denotes the source and quality of the video