When using their employer's network or computers, employees do not have a right to privacy. The Supreme Court has ruled that an employer's network is private property, and employers have the right to monitor Internet usage and block or limit visits to certain websites. E-mails sent through an employer's system are the employer's property, and employers are allowed to read or store all e-mails sent or received through their equipment or network. Employers are also allowed to discipline employees who use the Internet or computer equipment for personal use, if the employer has made their Internet policies clear to their employees.