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This tutorial is the fourth part of a series on working with PDF files in Java. The focus of this video is on encrypting a PDF file and adding a password to it. The necessary classes for this task are the standard protection policy class and the access permission class. The standard protection policy is used to add a password, while the access permission class is used to restrict user actions such as modifying, copying, or printing the document. By understanding and utilizing these two classes, we can successfully encrypt and protect the PDF document.