US Patent 9405887 Limiting concurrent viewing sessions on multiple user devices

System devices include network interfaces to communicate with user devices associated with a user, memories for storing instructions to be executed by processors, and the processors. The processors are configured to execute the instructions to receive, from a first user device, among the user devices, a request for content; initiate an upload of the requested content to the first user device in response to the request; receive a request for a license key from the first user device in response to the initiation of the upload; determine whether a number of concurrent sessions with the user devices exceeds a maximum number; and send the license key to the first user device when the processors determine that the number of concurrent sessions does not exceed the maximum number.