[TUHS] early INGRES licenses?

What type of licensing agreements (maybe informal) were used for the early INGRES tape distributions? I am trying to see if they were an example for BSD or how compared with early BSD. The BSD-style licenses were not introduced until 1987 and later (starting in but not completed in 4.3BSD-Tahoe). But various earlier BSD (distribution) components did have open source licenses long before that -- such as Eric Allman's trek (circa 1977) in 1BSD and MIT's X components (1985) shipped with 4.3BSD. The COPYRIGHT for INGRES 6.3/-1 (February 1, 1981) source shipped with 2.79BSD (Febuary 1981) indicated it was not open source: "... may not be reproduced or disclosed without the prior written permission of the owner." My BSD history book in progress has at least 15+ pages of examples and commentary and interview quotes about the history of proprietary and open source licensing in early BSDs. I also plan to research the history of licensing for W and early X.