A business form that is particularly suitable for use as a fishing and/or hunting license is easy to understand and use, is protected from moisture, chemicals and wear, allows for the entry of indicia that will be readable after use for a year, cannot readily be accurately photocopied, will not fade...http://www.google.es/patents/US5464254?utm_source=gb-gplus-sharePatente US5464254 - Fishing license protector
