Well, I wrote a letter, and got a response:
Dear Mr. Dickson:
I have received and reviewed your letter dated October 13, 2004 concerning your observation of Enviromental License Plates, which contain the letters "FDUBYA", which you consider not appropriate for California license plates.
On occasion, the department approves a plate configuration because all meanings of the configuration are not known. The California Vehicle Code, Section 5105(a) states we must refuse any license plate configuration which carries connotations offensive to good taste and decency, or which may be misleading to some of our citizens. In this particular instance, because of your notification to our office, we are exercising our right to request the surrender of the license plates.
I hope you can appreciate how difficult it is to balance an individual's constitutional rights to free speech and expression while protecting the sensibilities of all segments of our population.
Thank you for your interest in the California Environmental License Plate Program. If you have any other concerns or questions, please contact Carl Goldwire, at (916) 657-xxxx.
Carl Goldwire, Manager
Special Processing Unit