1. A method for limiting a number of devices that a user can use to synchronize with a cloud-based service, the method, comprising: receiving a login request to synchronize a device with the cloud-based service from the user; responsive to determining the number of devices that the user is allowed to use for content synchronization has been reached, determining whether the device has been authorized; responsive to determining that the number of devices that the user is allowed to use for content synchronization has not been reached, registering the device and allowing synchronization of the device with the cloud-based service.