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Even if it were to exist as a copyrighted property there would be no legal barrier to showing it publicly as long as there is no money involved. It would be akin to reading a book aloud in a public space. If the supposed tape had been sold then the buyer could show it as often and in any arena as he wanted as long as it was not for profit.
This is my only comment on this subject. I will wait for proof.
As a technical matter, I'd just say "it depends." Buying a work doesn't completely exhaust the rights of the creator of the work. For example, peer-to-peer sharing (no money involved) of music can violate copyright law.
But copyright law won't be the barrier between this material and publicity of it. Copyright holders can't outright prevent "copying." The most they are entitled to is reasonable payment. And this material (especially the inflammatory parts, if it exists) is of broad public interest, which augurs in favor of free (as in bier) distribution.