I hope you remember us little people if you ever decide to go pro, Roy...
DRM more bluntly is locking media to specific ways of consuming it (through specific devices, software, or whatever) so that "unauthorized" uses can be prevented rather than worrying about what to do about "offenders."
So rather than get into a messy court case about whether five seconds of video posted to your blog for critique counts as Fair Use, the setup prevents you from extracting the segment in the first place.
Unfortunately, it puts us in a weird legal position where the government is forbidden to prevent us from consuming and talking about content, but the content providers are actually encouraged to do so by the same government, thinking it has no way to protect us from other private actors.