Hmm. Since 1928 is the "Year of the Dictionary", https://public.oed.com/blog/1928-year-of-the-dictionary/ https://public.oed.com/blog/1928-year-of-the-dictionar

Hmm. Since 1928 is the "Year of the Dictionary", https://public.oed.com/blog/1928-year-of-the-dictionary/ https://public.oed.com/blog/1928-year-of-the-dictionary/ all of the first edition should be out of copyright on or after 2023, no? OTOH the first supplement is from 1933 so it will presumably still be in copyright for a while yet. That first supplement is important, so I'm surprised that the OP doesn't mention it. It's included in the first edition compact OED https://www.ebay.ie/itm/304361514092 https://www.ebay.ie/itm/304361514092 which sold lots of copies, and it contains the first OED entry for many words which you couldn't imagine not finding in a dictionary.