Expiration of online e-commerce account information

Bruce Schneier has a short but nice entry about the fact that the login information you often need to enter to buy products on-line, never expires. By supplying the information, you have effectively created an account at the vendor and are therefore liable for all activity on that account and are always a target for their on-line marketing efforts, etc.

He suggested that an option to terminate the commercial relationship between you and the vendor would be good. It would certainly let you manage your accounts yourself, as it should be!