The only rights to DOS Seattle Computer Products retained was the right to sell copies with hardware ("Expert C Programming", Lindauer, pg.169).
The licensed versions of DOS were OEM versions (using the OAK - OEM Adaptation Kit). Basically, they were just branded with the "big guys" name and copyright, and in some cases included code to contend with non-100% IBM PC compatible hardware.
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The only rights to DOS Seattle Computer Products retained was the right to sell copies with hardware ("Expert C Programming", Lindauer, pg.169). The licensed versions of DOS were OEM versions (using the OAK - OEM Adaptation Kit). Basically, they were just branded with the "big guys" name and copyright, and in some cases included code to contend with non-100% IBM PC compatible hardware.
It's not that funny... Windows has been around for 20 years and Microsoft still hasn't managed to make it decent.