The prefix "PureTaboo" typically indicates the production entity or series associated with the media.
This naming format is standardized to ensure that users or media management software can quickly identify the content, date, and participants without needing to open the file. or subtitle tracks in one file.
.mkv (Matroska Video). This is a flexible, open-standard container format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. or subtitle tracks in one file.