Function built into Preview-- except for batch mode..
Originally when I tested this out - it didnt appear to do anything one couldnt accomplish by simply printing to PDF (from Preview) and clicking on the "Security Options" button in the output dialog… but then it dawned on me, in that more and more I am putting stuff in the "cloud" - it would be nice to simply take the PDFs I already have, and in batch mode, encrypt them quickly rather than printing out each in Preview… that is where this application comes in real handy. Now I can take my financial receipts (even scanned ones) and quickly encrypt them for archiving.. Seems to work pretty quickly..
withtlc about PDF Security