D.C. Mun. Regs. tit. 17, § 8907
8907.1 Registration of trade name does not protect the name from use by any other person.
8907.2 The acceptance by the Department of a trade name registration shall not in any way be deemed a warranty of the applicant's right to do business in the District under the name registered, or exclusive use of that trade name by the registrant.
8907.3 The Department shall not be responsible for determining whether there is in existence any other business or organization carrying on, conducting, or transacting business using the same trade name, or that the same fictitious name is registered to more than one person.
SOURCE: As amended by Final Rulemaking published at 49 DCR 10075 (November 8, 2002).