A brief ring buffer is a fairly privacy-respecting implementation, as opposed to long-term capture and storage. Demonstrating that such a capability is in fact

A brief ring buffer is a fairly privacy-respecting implementation, as opposed to long-term capture and storage. Demonstrating that such a capability is in fact a brief ring buffer to the average Joe or Josephina on the street might prove more challenging, and numerous similar technologies have rapidly acquired a highly pejorative taint, e.g., "glassholes".