These mirror sites are generally considered unsafe. They often lack official verification and are frequently used to spread malware or intrusive advertising.
In almost every country with copyright laws (USA, UK, India, Canada, EU nations), downloading or distributing copyrighted content without permission is illegal. Using 123 mkvmovies violates the Copyright Act (in India: the Copyright Act of 1957, amended; in the US: the Digital Millennium Copyright Act). 123 mkvmovies
The phrase is typically associated with websites that host or link to pirated film content. "MKV" refers to a common high-quality video file format (Matroska), and "123" is a frequent prefix used by mirror sites to avoid takedowns. Safety & Legality These mirror sites are generally considered unsafe