Michael E. Cohen has updated Take Control of PDFpen to cover version 13 for Mac and version 6 for iOS and iPadOS. This was a different kind of update; Michael explains why there are few new features but a whole new look to the program, and why that is a good thing. He also helps us understand the inner workings of PDFs (without getting too geeky), and why that understanding is important when manipulating PDFs. Oh, and did we mention that this is a FREE book? Michael provides the details.

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