A lawyer shall not participate in offering or making:
Ill. Sup. Ct. R. 5.6
 An agreement restricting the right of lawyers to practice after leaving a firm not only limits their professional autonomy but also limits the freedom of clients to choose a lawyer. Paragraph (a) prohibits such agreements except for restrictions incident to provisions concerning retirement benefits for service with the firm.
 Paragraph (b) prohibits a lawyer from agreeing not to represent other persons in connection with settling a claim on behalf of a client.
 This Rule does not apply to prohibit restrictions that may be included in the terms of the sale of a law practice pursuant to Rule. .