Individuals offering to 'seal' architectural or engineering plans MUST HOLD A LICENSE TO DO SO IN THE STATE IN WHICH THE PROJECT IS. Many sellers on this site offer to seal plans and fraudulently use a licensed individual's seal unbeknownst to the professional. This is a violation of rules and laws that govern the practice of architecture and engineering in most states in the USA. Always be sure to obtain a license number and check with your state's licensing board to ensure it is valid. Buyer beware.