Patent ID: 7191187

Claim:
An identification code administration program for execution on a computer apparatus, comprising: a content administration section, which administers a content; an authentication section, which performs authentication of a user using both an identification code of the user browsing said content and a validity associated with said identification code, a page generation section, which generates a web page in which said user can browse the administered content subject to a success of said authentication; a validity information storage section, which stores identification code, a validity information associated with said identification code, and an e-mail address of the user identified by the identification code; a non-delivery notice e-mail receiving section, which receives a non-delivery notice e-mail notifying a non-delivery of an e-mail sent to the e-mail address of the user identified by the identification code; a non-delivery address obtaining section, which obtains a non-delivery e-mail address from the received non-delivery notice e-mail; and an identification code validity information changing section, which changes the validity of the identification code stored by said validity information storage section to invalid and stores said identification code by associating said identification code with the e-mail address obtained by said non-delivery address obtaining section; wherein said authentication section determines that the authentication according identification code stored by said validity information storage section has failed, wherein the identification code is correlated with the validity information that has been changed to invalid; a content transmission section, wherein said failed authentication prevents the transmission of the content to the user.