This document discusses several issues related to computer ethics and the consequences of widespread computer technology. It addresses the threats to computer systems from errors, natural hazards, and criminal activity. It defines computer crimes as those committed against computers or those using computers to enable other crimes. Specific threats discussed include viruses, theft of hardware/software/data, and using computers to facilitate traditional crimes. The document examines who may carry out computer crimes such as employees, outsiders, hackers, crackers, and professional criminals.