The principles are that BDSM activities should be:
Other people in the BDSM community do not consider SSC to be an accurate term for these relationships/activities. The term Risk Aware Consensual Kink (RACK) is sometimes used as a substitute description.
For those who dissent, issues generally arise from the subjective nature of each term in SSC when using the term as a yardstick to evaluate activities. It can be argued that the terms in RACK are equally subjective. "How safe is safe enough" is a legitimate question, and "how aware is aware enough" is an equally legitimate question.
Most attribute the term to David Stein who coined it in 1984 for GMSMA More information can be found in the essay titled Safe Sane Consensual: The Evolution of a Shibboleth, in which he states that the term was developed "to distinguish the kind of S/M I wanted to do from the criminally abusive or neurotically self-destructive behavior popularly associated with the term 'sadomasochism'."