What is the legal status of Apple Macintosh System 5 and earlier?

Question

Apple

Who knows what the legal status of Apple's outdated operating systems is.
I'm talking about System versions younger than 6-7 versions.
Did Apple open source at least the first versions of MacOS?

Answer 1

No, they didn't, why would they?
Apple is an office focused on using someone else's code, but not on disclosing its own.