Maybe I misunderstood the timing of the message, but
I thought that
the 1.0 version of DOS contained copyright information from Digital Research
and when IBM found out, they compelled MS to expunge it, resulting in the
1.1 version.
Urban myth
possibly based on exaggerations, or misunderstandings of copyright.
MS/PC-DOS 1.0 does not appear to contain any direct DR code, but it IS
blatently, admittedly, and understandably based directly on CP/M, since
QDOS consisted of a placeholder to substitute for an OS while waiting for
CP/M-86 to become available.
But the same identical story is TRUE for NEWDOS! -- versions prior to
-80 contained an encrypted copyright message by Randy Cook (changed to
Tandy Corp in TRS-DOS 2.3).
--
Grumpy Ol' Fred cisin(a)xenosoft.com