FILMING THE TRIAL is listed as public domain at YouTube. Let's hope that is the case. I would think that Oja has the copyright, but perhaps she, or her lawyers, forgot to renew it.
Around 2007-2008, a whole bunch of Welles rarities showed up on YouTube, including much of Magic Show. I remember joking that it looked like someone had uploaded the contents of Gary Graver's garage. Unfortunately, it all came down very quickly.
Let's hope this stays, and that there is more.