iText in Action Chapter 12: Protecting your PDF
iText 5 is the previous major version of iText’s leading PDF SDK. iText 5 is EOL, and is no longer developed, although we still provide support and security fixes. Switch your project to iText 8, our latest version which supports the latest PDF standards and technologies.
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These examples were written in the context of Chapter 12 of the book "iText in Action - Second Edition".