Another no-save PDF save option
Another way to save PDFs that don't allow saving from Safari or Preview (perhaps they require a password to save):
Open the document in Preview and select File » Mail Selected PDF Document and then drag the file from the opened Mail window to the Desktop. [crarko adds: I tested this, and it works as described.]
Source: http://feeds.macosxhints.com/click.phdo?i=285df0eddf8976fcd0497a5dec1af1d1
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