15th May 2009
If you reside in the United States then you can print out your own official photography license:
In the event you're stopped by overzealous law enforcement or security officials attempting to enforce fictitious laws, I've designed these fictitious and official-looking Photographer's Licenses. If you have Adobe Illustrator, you can download the EPS vector art file and print your own. You'll need a photo of yourself, and OCR (or a similar font) to fill in your personal information.
A useful reminder of where you stand as a photographer: Photography and The Law: Know Your Rights.