For detailed change lists and forum discussions, you can visit community sites like Fanedit.org Giftbearer
: Reincorporates superior alternate and deleted scenes from the Blu-ray to flesh out character motivations, particularly for Vickers and Weyland.
The a9 tag likely refers to a specific version (perhaps the 9th iteration) from a particular fan editor (pseudonymously named "A9" or similar). This isn't piracy to avoid payment; it's transformation—a loving but legally dubious act of authorship.
