Broadband network policy control has often been a somewhat contentious issue in the U.S. and other western markets. Everyone agrees that good network management is essential and often that means prioritising valuable packets over others that are deemed to be lower value, not time dependent, or possibly malicious. On a private network, the good traffic can be sorted from the bad. Enterprise networks, for instance, are under no obligation to carry gaming traffic during business hours. Large academic networks, including those operated by universities and school districts, have legal responsibilities to filter the traffic and ensure that student have access to learning resources but not adult content. Broadband operators and ISPs have similar motivations for performing network management but must balance freedom of speech and other civil liberty interests.