Appropriate Use – I agree to only access or use the Chevron systems, networks and data only as authorized by Chevron and required by my position. I agree to use Chevron communications systems in a professional manner understanding that all commutations are representative of Chevron. I agree not to use Chevron systems networks or data for personal gain. I agree to not use third party systems to access Chevron systems and to not use Chevron systems to access third party systems unless authorized by Chevron. I agree not to attempt unauthorized access to Chevron Systems or Networks, and not to knowingly install unauthorized malicious code (e.g., viruses, backdoors, Trojan horses, worms, rootkits, key loggers, password crackers) on any Chevron System or Network.