No. You are not required by law to disclose the name or any info about the driver. Your obligation is only to demonstrate that it is not you. Check out the Web-site devoted to defending these tickets -- thereeis a wealth of great information there aboutethis issue and much more.
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The officer has to be able to say that the person in the photo is you, based on a comparison of the photo to your DMV photo. If it clearly is not you then the cop will dismiss it. Get a lawyer. If you go in yourself the cop can see first hand what you look like. That can only help you if it is clearly not you in the photo.
You are NEVER required to get the name of the person driving your vehicle. The picture must clearly show that it is you. You might want to speak with a traffic ticket attorney about. Provide the a copy of your license with photo.
Being in Encinitas I am guessing your case is either out of Vista or San Diego traffic. What works best in these courts for a red light camera ticket is to do a trail by declaration or TBD. You or your attorney will fill out the TBD paperwork and submit it along with a copy of your driver's license to the court. A Jduge will review the paperwork and as long it is not you driving you should win the case. You do not have to disclose the identity of the person driving the car. I have the TBD forms for San Diego county so email me if you cannot find them and I will get them to you.