[cm]trance.2020.hd720p.mp4

Given the metadata in the filename, there are two highly probable types of content contained in this file:

: Always ensure you trust the source when downloading files with such naming patterns. Video files downloaded from unverified peer-to-peer networks can occasionally be masked malware or execute unwanted scripts if opened with outdated media players. [CM]Trance.2020.HD720P.mp4

: This bracketed prefix usually refers to the release group, encoder, or the specific site or uploader that distributed the file. Given the metadata in the filename, there are