Using External PDF Editors
PDFs are much more complex than they look. Under the hood, they’re a spaghetti-like network of things such as XObjects, Arrays, Page Tree Nodes, and Optional Content Groups. That’s why some edits can’t be undone in Acrobat (Figure 12.28). You’d break the spaghetti.
Figure 12.28. There is no Undo command for many operations in Acrobat. This is nature’s way of letting you know that PDF files are more complicated than you might think. At least you’re warned.
Even if you’re using some of the excellent, third-party add-ons for Acrobat to perform edits, it’s advisable to work on a copy of your file just in case things fall ...
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