PA no longer requires the license to be displayed in the middle of the back, haven't for the last several years. I will tell you why they did, so landowners and other hunters could get the license numbers to report violators, then the number could be used to find the culprit. Many hunters are still putting the license on their back even though they don't have to, however unless you are a foot away, you can't read the numbers on the new computer generated licenses. Funny fact, when the PGC decided they would drop the requirement to display licenses because the main reason for it was not moot. It required legislation to remove the requirement from the law. There is one company that makes the license holders for tho old style PA hunting licenses, they make singles and doubles that drop down for doe licenses. They lobbied the general assembly not to remove the requirement from the law because they would go out of business. It took several years for the general assembly to finally pass the removal of the requirement to wear the license. Quite frankly it never bothered me. There were other states that required the display of the license as well, but when computer generated licenses came on the scene, they dropped the requirement as well.