This basic tutorial describes the details on how to protect PDF with password in Java. It includes the basic steps and the code sample to demonstrate that using Java PDF password can be set with a few API calls only. Furthermore, different kinds of passwords like user or owner and encryption algorithms can also be configured for protecting PDF data.

Steps to Protect PDF with Password in Java

1. Add the reference to Aspose.PDF for Java library in your application for securing a PDF document
2. Load the input PDF file with the Document class to protect sensitive data in the PDF file
3. Secure the PDF document by setting the password string and other arguments in the encrypt method
4. Save the output PDF file while protecting it with the password

The above steps summarize how using Java PDF password protection features can be used in the applications. You can load the input PDF file and then decide if the password should be required every time the file is opened, or only when some modifications are needed in the document. Likewise, you can also choose between different encryption techniques like RC4, AES with 128-bit or 256-bit keys.

Code to Protect PDF with Password in Java

To encrypt PDF Java code is shared above that can be used without requiring any other third-party tool. You can secure the PDF file from unauthorized access or modifications by setting different document privileges to allow or forbid copy, print, and content extraction abilities using the encrypt method.

In this article, we have learned how using Java PDF password protection feature can be used in your applications. Whereas, if you want to learn to merge PDF files, refer to the article on how to merge PDF files in Java.