Azure Information Protection is used to automatically add a watermark to Microsoft Word documents that contain credit card information.
You use Azure Information Protection labels to apply classification to documents and emails. When you do this, the classification is identifiable regardless of where the data is stored or with whom it's shared. The labels can include visual markings such as a header, footer, or watermark.
Labels can be applied automatically by administrators who define rules and conditions, manually by users, or a combination where users are given recommendations. In this question, we would configure a label to be automatically applied to Microsoft Word documents that contain credit card information. The label would then add the watermark to the documents.
Reference:
https://docs.microsoft.com/en-us/azure/information-protection/what-is-information-protection
https://docs.microsoft.com/en-us/azure/information-protection/infoprotect-quick-start-tutorial