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The NSA Has a Long-Lost Lecture by Adm. Grace Hopper
(www.schneier.com)
This is a most excellent place for technology news and articles.
Redaction means it’s still classified for some reason. Makes me wonder what they think might still be sensitive on a 40+ year old lecture like this, when DOJ guidelines call for automatic declassification of “records having permanent historical value” after only 25 years unless they fall into a handful of very specific categories, like divulging the identity of an active agent.
The simple/charitable explanation might be that they don't necessarily expect there to be anything that still needs to be redacted, but they won't release it until they're sure.