Customers who are interested in finding out if another person is downloading movies illegally from a specific account are most frequently alerted to the activity by an internet provider. The United States Copyright Alert System is a program that allows major internet providers to monitor popular download sites and send notices to Internet protocol addresses that are flagged as using the illegal services, as reported by Forbes.
The MPAA and RIAA work closely with third party monitoring companies who keep track of illegal downloads on sites like Pirate Bay. Cable companies also monitor bandwidth activity of their customers and can send up to six warnings to those suspected of illegal downloads. If the activity continues, the provider can slow down the Internet bandwidth or require that the customer is educated about downloads before allowing continued access to the internet.
Customers who wish to monitor the bandwidth being used by an account can do so by logging into a service provider and using online tools that show much data is being used, according to HowToGeek.com.
Other options for keeping track of bandwidth is to download a third-party program that tracks activity over a network through its router. Firmware programs like DD-WRT allows a user to track all of the activity on a network instead of just one computer.