This is the headline act. Most modern widescreen films are presented in Scope (2.35:1 or 2.39:1). They are essentially a letterbox strip. However, many directors shoot the film using the full height of the 35mm film negative or digital sensor (usually 1.33:1 or 1.78:1—aka 16:9). They then "matte" (mask) the top and bottom to achieve the cinematic widescreen look.
Open Matte removes that mask. It opens the frame vertically.
Film: Fast & Furious (4th in the franchise)
Year: 2009
Source: WEB‑DL (likely from a streaming provider)
Resolution: 1080p
Aspect Ratio (Open Matte): ~1.78:1 (16:9)
Comparison to Theatrical: Theatrical version = 2.39:1 (scope)
This release circulates on private torrent trackers (e.g., PrivateHD, HDBits, Blutopia) and Usenet. It is not available on mainstream streaming services today – most services now use the standard 2.40:1 transfer.