British Image restorationist, composer, amateur photographer and artist, and Wikipedian
As Adam lives in Britain, which makes it incredibly easy to acquire copyright in his works, he grants, if needed, an irrevokable license to use this work however you see fit. He requests attribution where possible, and realises that "where possible" means that that request is not legally enforcable. Adam Cuerden (talk) 15:44, 16 January 2022 (UTC)
"Rights Advisory: No information on creator or on reproduction rights found with the image, 2001."
This appears to be a publicity photo. It would appear that the origin of the photo was CBS-TV, Skelton's employer, who provided the photo to the newspaper for publicity purposes.
This photo was produced prior to 1978 and has no copyright markings.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.