That continues: "However, according to established case law, the courts have said that copyright can only subsist in subject matter that is original in the sense that it is the author’s own ‘intellectual creation’. Given this criterion, it seems unlikely that what is merely a retouched, digitised image of an older work can be considered as ‘original’."

There has been a huge attempt by Bridgeman and others to create FUD in this area. It didn't work. Partly because Wikipedia is willing to go to court if necessary.[1]

[1] https://en.wikipedia.org/wiki/National_Portrait_Gallery_and_...