Well… This is interesting…

Windows 10 won’t run games that employ SafeDisc or certain versions of Securom DRM, rendering hundreds of old disc-based games potentially unplayable without complex workarounds.

Source: Windows 10 Won’t Run Games Using SafeDisc Or Securom DRM | Rock, Paper, Shotgun

Their reasons appear to be good, many of those old DRM schemes were a bit … dodgy.  It does suck that older games will be rendered unplayable, unless the person knows how to work around the issues presented by the old DRM.