This is the label or studio code. In this specific case, "ADN" is the prefix for Attackers , a well-known production studio famous for its cinematic approach and specific thematic niches.
Filenames that include "i---" or other unusual prefixes are often modified by uploaders. Be cautious of executable files (.exe) disguised as video files. i--- ADN-564.mp4
Many databases and streaming sites are heavy on intrusive ads that can lead to phishing sites. This is the label or studio code
Tracking when the content was first made available. "ADN" is the prefix for Attackers
Understanding the themes and "niches" of the production. Safe Browsing and Security Tips