and afaic, securom is cancer... litteraly...
Early versions of this piece of junk trashed a cd player of mine (the hardware device, i mean; it was a known/acknowledged bug with some games)
the second (and last time before i entered the ban drm crusade path) was with physical version of NWN2 at its release days, the securom process suck up to 50% of CPU activity.
Also it used to prevent games from launching if it detected (so it sort of had scanned before that) some "so called questionable or illegal piracy softwares" on your system, such as microsoft techlab's Process Explorer (task manager replacement by Mark Rusinowitz) or "nero burning rom PRO version" and wouldnt launch game until full computer reset
also in the troubleshooting faq, it suggested to shut down one's firewall and antivirus before launching in case of additional problems... Yeeeeeahhh right !
sorry for the ranting but securom usually turns me red
Modern copies of Mirror's Edge just use the SecuROM variant that puts in a NULL'd registry key with checkin on hardware change. It's fairly benign. Though I will say it's annoying that EA slaps it on everything, and even puts Origin DRM on their DOS games. Ugh.
Also, a TON of anti-hack/cheat software will detect and fail if you've launched Process Explorer. Some will fail even if Process Explorer is closed before a reboot (!) as PE tends to clean up poorly. This is particularly prevalent in Korean-made MMOs as they have extremely aggressive checking due to the prevalence of hacks/cheats from their neighbor.