troductio: s #51-73

Introduction: Hacks #51-73

A lot of people think of PDFs as frozen files, printed once and then impossible to modify. That isn't the case, however! Whether you have Adobe Acrobat or not, there are lots of ways to manipulate PDF files: breaking them up, making their file sizes smaller, encrypting and decrypting them, and presenting them to users in different ways.

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