Background: The Birth of a Nation (originally called The Clansman) is a 1915 American silent epic drama film directed and co-produced by D. W. Griffith and starring Lillian Gish. The screenplay is adapted from the novel and play The Clansman, both by Thomas Dixon Jr., as well as Dixon's novel The Leopard's Spots. Griffith co-wrote the screenplay with Frank E. Woods, and co-produced the film with Harry Aitken. It was released on February 8, 1915.
Context: The Birth of a Nation, even more than other films in the public domain, has been poorly represented in later releases. The problem, in part, is that Griffith and others have reworked the film, leaving no definitive version. According to the silent film website Brenton Film, "there are a multitude of poor quality DVDs with different edits, scores, running speeds and usually in definitely unoriginal black and white".  There are exceptions. Among them is film preservationist David Shepard's 1992 transfer of a 16mm print for VHS and laserdisc release via Image Entertainment. A short documentary, The Making of The Birth of a Nation, newly produced and narrated by Shepard, was also included. Both were released on DVD by Image in 1998 and the UK's Eureka Entertainment in 2000.  In the UK, Photoplay Productions restored the Museum of Modern Art's 35mm print that was the source of Shepard's 16 mm print, though they also augmented it with extra material from the British Film Institute. It was also given a full orchestral recording of the original Breil score. Though broadcast on Channel 4 television and theatrically screened many times, Photoplay's 1993 version was never released on home video.  Shepard's transfer and documentary were reissued in the US by Kino Video in 2002, this time in a 2-DVD set with added extras on the second disc. These included several Civil War shorts also directed by D.W. Griffith. In 2011, Kino prepared a HD transfer of a 35 mm negative from the Paul Killiam Collection. They added some material from the Library of Congress and gave it a new compilation score. This version was released on Blu-ray by Kino in the US, Eureka in the UK (as part of their "Masters of Cinema" collection) and Divisa Home Video in Spain.  In 2015, the year of the film's centenary, Photoplay Productions' Patrick Stanbury, in conjunction with the British Film Institute, carried out the first full restoration. It mostly used new 4K scans of the LoC's original camera negative, along with other early generation material. It, too, was given the original Breil score and featured the film's original tinting for the first time since its 1915 release. The restoration was released on a 2-Blu-ray set by the BFI, alongside a host of extras, including many other newly restored Civil War-related films from the period.
Question: How has the film been restored since?. Whats the answer?
this time in a 2-DVD set with added extras on the second disc.