Patent attributes
A transmitting computing system's use of an audio signal to grant users of receiving computing systems access to a resource. These other receiving systems are in close proximity to the transmitting system so that they hear the audio signal on their microphones. Upon receiving the audio signal, a given receiving system sends a message representing that received audio signal to a resource server system that regulates access to that resource. The transmitting system and resource server system may have coordinated that the ability to send such a message is sufficient for access to be granted to the sender of that message. The resource server system thus determines that the message correlates to the resource, and thereby grants the user of the receiving system access to the resource. Thus, the principles described herein allow for an actual audio signal to efficiently grant resource access to other proximate users.