i'd consider a rootkit any key that hides itself and/or makes low level calls. installs or interferes with other software/hardware ninja style. lets not forget that alot of hackers get hired by large companies. good enough for me to call it a rootkit. frankly i dont care as long as it doesnt interfere with my gaming or slow my OS or cause harm to hardware firmwares. havnt had any DRM issues with any games i've bought in last couple of years, not since starforce anyway.