The lettering must be at least four inches in height and shall be displayed on at least two surfaces of the vehicle. Please print or type.Below you will find our authorization form template that you may copy fill out on your computer and print. The letter should include the individual's job title, business name, location, business license number(s), business phone number and contact phone number. There are no laws that stop you from copying "do not duplicate" keys. The warning on many keys isn't a rule you must follow; it's just a suggestion. Sample Letter of Authorization. For All Restricted Key Products. An effective access control. Application for a Nevada Gaming license -State Form 1.