This is the rarest part of the equation. The tag refers to a specific internal release group (scene or P2P) that remastered the film to celebrate the 15th anniversary of the MCU’s Phase 1. This version is "exclusive" because it includes:
Here are the technical specifications for the Iron Man 2 Blu-ray 1080p dual audio 1.5 exclusive release: iron man 2 bluray 1080p dual audio 15 exclusive
Preserved chapter markers for easy navigation through the film's action sequences. Quality Considerations Bitrate Trade-off: This is the rarest part of the equation