: This is a common note in file-sharing communities meaning "No Password" is required to extract the files.
: Indicates the video resolution (3840 x 2160 pixels), suggesting high-definition quality.
The components of this string describe the technical "features" or properties of the file being sought:
The components of this string indicate how the file is formatted and shared: : The identifier for the creator or subject of the video. On The Sofa : The descriptive title of the specific video scene. 4k Full Vid