Examples described herein may include a first playback device sending a first request for first media content to a computing system associated with a media service provider and a second playback device sending a second request for second media content to the computing system. The first and second playback devices may be associated with an account of the media service provider. The computing system may determine whether either or both of the first and second playback devices are allowed to receive the respective requested media content based on information included in the first request and the second request. Such information included in the requests may characterize playback operations respectively associated with the requests and/or may indicate a time at which the respective playback devices last received a playback command.