Part 503 - Improper Business Practices and Personal Conflicts of Interest Subpart 503.1 - Safeguards 503.101 Standards of conduct. 503.101-3 Agency regulations. 503.104 Procurement integrity. 503.104-2 General. 503.104-4 Disclosure, protection, and marking of contractor bid or proposal information and source selection information. 503.104-7 Violations or possible violations. Subpart 503.2 - Contractor Gratuities to Government Personnel 503.203 Reporting suspected violations of the Gratuities clause. 503.204 Treatment of violations. Subpart 503.3 - Reports of Suspected Antitrust Violations 503.303 Reporting suspected antitrust violations. Subpart 503.4 - Contingent Fees 503.405 Misrepresentations or violations of the Covenant Against Contingent Fees. Subpart 503.5 - Other Improper Business Practices 503.570 Advertising. 503.570-1 Policy. 503.570-2 Contract clause. Subpart 503.7 - Voiding and Rescinding Contracts 503.703 Authority. 503.705 Procedures. Subpart 503.8 - Limitation on the Payment of Funds to Influence Federal Transactions 503.806 Processing suspected violations. Subpart 503.10 - Contractor Code of Business Ethics and Conduct 503.1004 Contract clauses.