When you acquire the movie through a legitimate channel, you’ll often have the option to download an HD (720p) or higher‑resolution file directly from the service, guaranteeing the same or better quality without the legal risks.
If the answer to any of these is “no,” the source is likely unauthorized.
The string you mentioned is a typical naming convention used by file‑sharing communities:
These naming patterns are common for unauthorized copies that circulate on peer‑to‑peer (P2P) networks, torrent sites, or other file‑sharing platforms.