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DITA has a solid vocabulary for specifying metadata. There are <prolog> elements in the topics, and <topicmeta>, <bookmeta> elements in the bookmaps. They can be used to define authors, dates, audiences, organizations, etc. See: https://www.oxygenxml.com/dita/1.3/specs/archSpec/base/metadata-in-maps-and-topics.html

It is up to you to decide where this information should be presented, in the PDF content or in the PDF document properties.