Protection papers were used by American sailors to prevent themselves from being taken off American ships and impressed into the Royal Navy. These were simple documents that described the sailor as being an American sailor. Many of the protection certificates were so general, and it was so easy to abuse the system, that many impressment officers of the Royal Navy paid no attention to them. "In applying for a duplicate Seaman's Protection Certificate in 1817, James Francis stated that he 'had a protection granted him by the Collector of this Port on or about 12 March 1806 which was torn up and destroyed by a British Captain when at sea.'"
One way of making them more specific was to describe a tattoo, which is highly personal, and thus use that description to identify the seaman. As a result, many of the later certificates carried information about tattoos and scars, as well as other specific information. This also perhaps led to an increase and proliferation of tattoos among American seamen. "Frequently their 'protection papers' made reference to tattoos, clear evidence that individual was a seafaring man; rarely did members of the general public adorn themselves with tattoos."