D.C. Mun. Regs. tit. 31, § 813
An operator who provides service with a vehicle that displays on its exterior the name, logo, insignia, or other unique branding of a taxicab fleet or association shall obtain the consent of such taxicab fleet or association prior to the operator's association with:
(a) A PSP, for thirty (30) days following the effective date of this rulemaking, if such fleet or association is providing credit card processing services to its associated operators; or after thirty (30) days following the effective date of this rulemaking, such fleet or association has filed an application or been approved as a PSP under Chapter 4; and
(b) A DDS, for thirty (30) days following the effective date of this rulemaking, if such fleet or association is operating a dispatch service limited to its associated vehicles; or after thirty (30) days following the effective date of this rulemaking, such fleet or association has filed an application or received operating authority as a DDS under Chapter 16.
SOURCE: Final Rulemaking published at 60 DCR 10997 (July 26, 2013).