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Re:WordStar: A Writer's Word Processor (1996) by LocalH on Saturday March 06, 2021 @04:55PM (#26370885)
>(from memory I think WordMaster (an earlier WP that predated WordStar), was actually first—someone correct me if I'm wrong)

From a cursory search, it seems that WordMaster is the direct predecessor to WordStar, programmed by the same person.

Re:WordStar: A Writer's Word Processor (1996) by hilbert42 on Saturday March 06, 2021 @05:37PM (#26371156)
From memory—it's been a long time—WordMaster was MicroPro's first product so presumably Rubinstein applied the EULA to it first (thus it was likely the first with an EULA). If not, then I'd guess he'd have applied the EULA with later issues/releases as WordMaster was also concurrently available along with WordStar.

Anyone with an original CP/M WordMaster 8" floppy (or its contents) to check?