Oh wow, this is that lecture they supposedly couldn’t digitize:
While NSA did not possess the equipment required to access the footage from the media format in which it was preserved, NSA deemed the footage to be of significant public interest and requested assistance from the National Archives and Records Administration (NARA) to retrieve the footage. NARA’s Special Media Department was able to retrieve the footage contained on two 1’ AMPEX tapes and transferred the footage to NSA to be reviewed for public release.