Protecting Documents with Credit Card Numbers

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To protect documents containing credit card numbers from being opened by users outside your company, you should use a sensitivity label. A sensitivity label is a tool in Microsoft Information Protection that allows you to classify and protect your organization's sensitive information. Sensitivity labels can be applied to files and emails, and can control access, encryption, and other protection measures.

Sensitivity labels can be configured to limit access to a specific set of users or groups, such as only users within your company. This means that only authorized personnel within your company will be able to access documents containing credit card numbers. Users outside your company will be denied access.

Additionally, sensitivity labels can be configured to apply protection measures such as encryption, watermarks, and restrictions on printing, copying, and sharing. This helps to ensure that sensitive information remains secure even if it falls into the wrong hands.

A sensitivity label policy can be used to automatically apply sensitivity labels to documents based on certain criteria, such as file type or location. This helps to ensure that all sensitive documents are properly classified and protected.

Retention policies are used to manage the retention and disposal of documents based on their content and other factors. While retention policies can be used to protect sensitive information, they do not control access to documents.

Data loss prevention (DLP) policies are used to detect and prevent the accidental or intentional disclosure of sensitive information. While DLP policies can be used to protect sensitive information, they do not control access to documents.

In summary, to protect documents containing credit card numbers from being opened by users outside your company, you should use a sensitivity label with a policy that limits access to users within your company.