Over at Macintouch, a reader asked how to "lock" pdfs in Lion. He confused Lion's file lock feature with password protection.
I suggested Adobe Acrobat, and wrote that Reader and Preview can't password protect files.
Another Macintouch reader corrected me on that point. I was technically correct, you can't add password protection to an open file like you can in Acrobat. It's not obvious, but Preview can be used to make a password protected copy of an open pdf.
Choose Export in Preview > File and check the "Encrypt" box.
I'd never seen that option.
Discussion of general issues, not related to a specific Mac or iDevice operating system.
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