"his stage version in 1899"

Film The Bioscope has a couple of fascinating posts about Arthur Conan Doyle and Sherlock Holmes during the silent era. Much of time seems have been spent fighting copyright infringement:

"The Stoll series raised the thorny issue of copyright once more. Doyle had instructed his literary agent to check the validity of his copyrights in the USA before he signed his deal with Stoll in 1920, but American interests challenged the Stoll series nonetheless. The Goldwyn Corporation argued that Doyle had sold the dramatic rights to the Holmes stories when William Gillette had created his stage version in 1899, rights which then passed on to the Essanay company in 1916 when a feature film was made of Gillette’s play (starring Gillette), and then to Goldwyn, which produced the feature film Sherlock Holmes in 1922, with John Barrymore as the detective. The case was thrown out by the New York Supreme Court, but it demonstrated the muddle that Doyle (or his representatives) had created and the difficulty the law had in separating stage from screen."

They've also compiled a filmography from various sources. Sounds like the Alan Barnes book could be an essential purchase, assuming there isn't going to be an update ...