The earlier video from the series, GG46955 IBM SYSTEM/360 READ ONLY STORAGE, is dated to 1964
https://www.youtube.com/watch?v=gcc_SAy-I80
If the videos are indeed so old, then probably they were not intended for customers but for the internal training of IBM employees, which would match the "CONFIDENTIAL" label.
alt Hacker News
If the videos are indeed so old, then probably they were not intended for customers but for the internal training of IBM employees, which would match the "CONFIDENTIAL" label.