Conversation so far:
What media platforms is the film The Birth of a Nation on?
Many home media releases of The Birth of a Nation consisted of poor quality DVDs with different edits, scores, running speeds and usually in definitely unoriginal black and white.
Which is the official version of The Birth of a Nation recorded on?
Griffith and others had frequently reworked The Birth of a Nation, leaving no definitive version.
Where is the original The Birth of a Nation now?

Question: How has the film been restored since?
Self-contained rewrite: How has the film, The Birth of a Nation been restored since the original version of the film?