Access to protected content is based on a client device being within a region. The region may be a mobile or movable region, and/or a region that is in motion. In some embodiments, the region may be determined based on a distance from a position within the region, or based on a boundary about the position that need not be symmetrical. In some embodiments, the region is a three dimensional region. In some embodiments, being within the region is further based on the region being above a defined altitude. In further embodiments, a determination for access is based on whether the client device is detected to be in motion relative to the region.