Yes and no. Because of the way licensing and trademark laws work, particularly with film, while the novels are public domain,
the characters and world are licensed, still, for film and other media. This is why we saw ERB Inc try to take action against Dynamite, a couple years back.
It's silly - from my perspective - and probably suspect in some ways, but it is within their legal range. The mockbuster wth Tracy Lords is about as close as you can get in movies, without the license, because they aggressively defend themselves as custodians and all unlicensed usage as an unauthorized trading on their name, that they're misidentified with these versions.