Section 551.405 - Provision of services(a) The prohibitions on transactions contained in § 551.201 apply to services performed in the United States or by U.S. persons, wherever located, including by a foreign branch of an entity located in the United States:(1) On behalf of or for the benefit of a person whose property and interests in property are blocked pursuant to § 551.201 ; or(2) With respect to property interests of any person whose property and interests in property are blocked pursuant to § 551.201 .(b) For example, U.S. persons may not, except as authorized by or pursuant to this part, provide legal, accounting, financial, brokering, freight forwarding, transportation, public relations, or other services to a person whose property and interests in property are blocked pursuant to § 551.201 .Note 1 to § 551.405 . See§§ 551.507 and 551.509 on licensing policy with regard to the provision of certain legal and emergency medical services.