You will not find direct download links to these massive files on mainstream, legal search queries due to the files containing copyrighted footage owned by Disney.

"Come on," Kael whispered, his eyes wide, reflecting the glow of the unfinished transfer. "Stay on target."

The codec. This file uses compression. A 4K scan of a 35mm film reel, uncompressed, is roughly 6–10 Terabytes. x265 compresses it down to manageable sizes (usually 40GB to 90GB for a feature film) while preserving the grain structure. If this were x264, the grain would cause macroblocking; x265 handles analog noise much more efficiently.