For the most part, you would license your specific use rather than attempting to purchase rights for the entire series. To license a work, contact the copyright holder in writing, explaining your proposed use in detail.
Toei Animation has copyright over Digimon for the TV series and movie, Bandai of Japan has copyright for the Japanese Digimon video games, Bandai of America has copyright for the English Digimon video games and Saban Brands has copyright over Digimon for the English dubbed.
Episodes before July 1968: ABC Weekend Television Episodes after July 1968: Thames Television
1949-1954: Apex Film Corp. 1954-1957: Wrather Productions
The first place to check would be the distributor, BBC. If they can't license it, they can direct you to the company that can.
Provided all necessary documentation was filed yes the 1966-68 TV series would still be under copyright protection.
Fztvseries was closed due to copyright infringement by Fact Uk but you can find alternative site to download your TV series at the Related Link.
No evidence it is except for a DVD release stating 26 episodes were. Certainly not if the copyright was properly renewed and for a show that big I expect it is not PD.
Of course! He's a TV character adored by millions of fans! There has to be copyright!
Yes!
You have to contact the original copyright holder of the series. They still own anything having to do with that television show. Once you have their permission, you can write to a publisher -- probably a good idea would be to contact the publisher of the original book series.
There are a number of copyright holders, but most uses can be licensed through Warner Bros. Television.
No, the TV series "Thriller" hosted by Boris Karloff is not in the public domain. The copyright for the series is still held by its creators and/or rights holders, so permission would be required to use or distribute the episodes.