Patent ID: 7809947

Claim:
A method of operating a digital broadcast receiver having stored therein a code certificate list including information correlating a content item with a user ID and a password, and information correlating the user ID and the password with a user code, the method comprising: displaying a screen for prompting input of the user code for user authentication about the content item in place of an input of the user ID and the password for the user authentication about the content item, the user code containing one or more numerals and/or characters less than a number of numerals and/or character contained in the user ID and the password; receiving the input of the user code input; retrieving the stored user UD and the stored password from the code certificate list based on the information correlating the content item with a user ID and password and based on the information correlating the user ID and the password with the user code; transmitting the retrieved user ID and password to a broadcasting station for the user authentication about the content item, and receiving the content item after the user authentication.