scope:

This document specifies how to extend the specification contained in ISO 32000-2 by adding extensions to the Encrypt dictionary to support the Advanced Encryption Standard (AES) Galois/Counter Mode (GCM) encryption algorithm. These extensions are intended for developers of: - software that creates PDF files (PDF writers); - software that reads existing PDF files and (usually) interprets their contents for display (PDF readers); - software that reads and displays PDF content and interacts with the computer users to possibly modify and save the PDF file (interactive PDF processors) and PDF products that read and/or write PDF files for a variety of other purposes (PDF processors). NOTE - PDF writers and PDF readers are more specialized classifications of interactive PDF processors and all are PDF processors. This document does not specify the following: - specific processes for converting paper or electronic documents to the PDF file format; - specific technical design, user interface implementation, or operational details of rendering; - specific physical methods of storing these documents such as media and storage conditions; - methods for validating the conformance of PDF files or PDF processors; - required computer hardware and/or operating system.