Programming languages cannot be copyrighted, says senior EU court adviser
itworld.com
itworld.com
So it sounds like programming languages are considered inherently functional, and thus not covered by copyright.
Then again, for a system which sells mainly by virtue of traditional monopoly and being a legacy system, it is not surprising they would fight a case against copying their incoherent and utterly unintuitive language.
Early on (25-30 years ago) a family member worked there, and I was a summer intern there. I picked up a few things which seem relevant here.
There was reportedly some guy by the name of Mr. Bass who (as in this case) began publishing a workalike product called "The Bass System".
Originally the name "SAS" was an acronym for "Statistical Analysis System". I heard it was changed, at least in part, due to ambiguities pertaining to trademarking acronyms. I don't know if this was related to Mr. Bass in particular.