Unlocking PDF Ebooks
Adobe provides a method of locking PDF files so they can't be sometimes printed, changed or otherwise altered in any form.
You can buy PDF-cracking software but if you have a Mac you can do it for free.
Open up sherlock, type in colorsync. Open up the colorsync application and use that to open up the PDF file. Colorsync breaks the lock.
This is an old printer's trick. If you work in prepress long enough, you encounter a situation where a customer has a PDF file that needs to be printed but the graphic designer is unable to provide the code (because the graphic designer went off and died somewhere).
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