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Jim King from Adobe has published a paper on the evolution of the PDF file format over the past 15 years. The paper is available for download from his Inside PDF blog and also addresses the important issue of backwards compatibility:
Adobe tried very hard to allow new PDF files with new features to be viewable in older viewers. Likewise, we tried to design our viewers so that when they were the “old viewer” they would do the best that they could to display a file even if it had new features. And perhaps most important of all, we almost never removed any feature from PDF so that any file could be viewed by today’s viewers even if the file was made 16 years ago.
Like the other material that Jim has posted online, this paper is sure to be a very interesting and insightful read.
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