You may have the ability to request that certain personal information is not shared in specific cases. Perhaps you do not want non-financial companies to get a look at your data, or maybe you would rather that certain branches of your bank not have access to sensitive information about you. Still, your request may be overridden by the law and certain information may be exempt from your request for protection.
An issuer may notify you of changes to a credit card's terms involving the interest rate, the events which trigger the credit card's default APR, and various fees.
The notification of a change in the credit card's terms can also offer you the chance to opt out -- that is, the ability to decide you don't want to continue using the card once the new terms take effect. Opting out involves notifying the credit card issuer that you do not accept the changes. You will need to read your opt out information carefully to find out the proper way to opt out.
Opting out of card terms that no longer resemble what you signed up for can be a smart decision. After all, if you applied for a low interest credit card, but the new terms put you in danger of triggering a high default APR, then you may not want to accept the changes to your credit card.