DR 5-104 Limiting Business Relations with a Client.

1. A lawyer shall not enter into a business transaction with a client if they have differing interests therein and if the client expects the lawyer to exercise his professional judgment therein for the protection of the client, unless the client has consented after full disclosure.
2. Prior to conclusion of all aspects of the matter giving rise to his employment, a lawyer shall not enter into any arrangement or understanding with a client or a prospective client by which he acquires an interest in publication rights with respect to the subject matter of his employment or proposed employment.