thanks, skybandit. it confirms the infos i had.
anyay, i found there is a TV series of 1954 (39 half-hour episodes) wich should be in public domain.
this is the info i found on the web
"The first and only American television series of Sherlock Holmes adventures aired in syndication in the fall of 1954. The 39 half-hour mostly original stories were produced by Sheldon Reynolds and filmed in France by Guild Films, starring Ronald Howard (son of Leslie Howard) as Holmes and Howard Marion Crawford as Watson. Archie Duncan appeared in many episodes as Inspector Lestrade (and a few as other characters). Richard Larke, billed as Kenneth Richards, played Sgt. Wilkins in about fifteen episodes. The series’ associate producer, Nicole Milinaire, was one of the first women to attain a senior production role in a television series."
Archive.org list it under "Public Domain"