Interesting post that shows copyright issues are starting to hurt education needs as well.
I think, for purely education reasons, things like this should be more a matter of courtesy after x number of years. (I don't know what "x" should be but I think there is likely a useful number). Who owns the rights to the Zapruder JFK shot? If someone was doing an educational (i.e. no money being made for it - and YES that includes documentaries!) broadcast/video, then common sense should prevail, ensuring that valuable footage is never lost.
Boing Boing: How copyright is killing culture