Another difference between North American FTA and FTA in most of the rest of the world is that in North America, very few of the available signals are actually intended for home viewers or other end-users. Instead, they are generally intended for reception by local television stations, cable system headends, or other commercial users. While it is generally thought to be legal for home viewers to view such transmissions as long as they are not encrypted, this means that there are several unique challenges to viewing FTA signals, challenges not present in other areas of the world. Among these are: