Some countries require by law certain information to be included on advertisements or leaflets offering goods or services. Advertisers include this information in small print in order to meet the requirements while drawing the minimum attention away from their sales message.
In other cases, small print is used to preempt claims of false advertising with statements such as the common "Dramatization" or "Actors shown". In extreme cases these subtle notices may not be considered sufficient, but they can considerably strengthen a company's defense.
Unscrupulous businesses may use jargon (which is usually very obtuse legal style writing) in contractual small print to conceal terms disadvantageous to the other party, or to obscure legal rights and obligations. Consumer protection laws have been enacted in several jurisdictions in order to combat this.