One interesting thing to note is that any copyright analysis using today's acts is possibly wrong :) These tapes predate the most recent major copyright act (t

One interesting thing to note is that any copyright analysis using today's acts is possibly wrong :) These tapes predate the most recent major copyright act (they were made in 1974, the act was passed in 1976). For example, among other things (i'm lazy and quoting wikipedia, which is correct in this point): Under the 1909 Act, federal statutory copyright protection attached to original works only when those works were 1) published and 2) had a notice of copyright affixed. If no notice of copyright was affixed to a work and the work was "published" in a legal sense, the 1909 Act provided no copyright protection and the work became part of the public domain.