Originally a comment by Jafafa Hots on IS cannot destroy these.
They may not be able to destroy public domain art, but US corporations are sure trying.
I have put up YouTube videos backed with public domain music. Every one has had a copyright claim filed against it despite the music being pre-1923, all of it acquired by me from public domain archives. One had three separate entities attempt to claim ownership of it.
I currently have one appeal under review, has been for a couple of weeks, where a company is claiming the rights to a song, “I Didn’t Raise My Son to be a Soldier,” recorded by the Peerless Quartet in 1914 – over 100 years ago. This is routine. These companies literally are downloading public domain works, adding them to their catalogs and claiming ownership, knowing that most people won’t dispute it.