To become a SMPTE 298M Registration Authority you must contact

Program Administrator
United States Joint ISO-CCITT Registration Authority
American National Standards Institute
11 West 42nd Street
New York, NY 10036
(212) 642-4900

and ask for information on

Registering Organization Names in the United States of America under the Joint-ISO-CCITT Arc

Registration Procedures for the United States Joint Registration Authority

Note.--The paper refers to ITU/ISO, not CCITT/ISO because the CCITT is now the ITU although the naming conventions have not yet changed. Also, becoming your own registration authority is tedious -- much harder than obtaining an Internet Domain name. One would hope this would change if there were more demand.