: A PROPER release is issued when a previous release by a different group is "nuked" (invalidated) because of technical errors like out-of-sync audio, missing frames, incorrect aspect ratios, or installation issues.

: These releases follow strict "Scene rules" that define how content should be packaged and distributed. If those rules are broken, a PROPER is required to provide the community with a "correct" version. Why You Might See It for "The Legend of Korra"

: The initial release's bypass or "crack" didn't work on certain operating systems or hardware.