At its core, The Secret Life of Walter Mitty (2013) deals with the displacement of the old world by the new. As Life magazine moves toward an online-only format, Walter—a "Negative Assets Manager"—is a relic of the physical world.
The "MUL" tag in digital releases usually indicates a or Multi-Language track. For a global film like this, audio is as important as the visuals. The soundtrack, featuring José González and Theodore Shapiro, acts as the heartbeat of the movie. The Secret Life Of Walter Mitty 2013 1080p -MUL...
Your search keyword cuts off at “-MUL…” . In release group naming conventions (common in P2P and scene releases), this likely stands for — indicating a version with multiple audio tracks and subtitles (e.g., English, Spanish, French, German). It might also refer to “MUL” as a tag for a release group or encode type. At its core, The Secret Life of Walter