Recently I needed to merge several PDF files into a single file and also encrypt it. So after some googling, here my recipe:
gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOwnerPassword=password1 -sUserPassword=password2 -dKeyLength=128 -dEncryptionR=3 -sOutputFile=output.pdf input1.pdf input2.pdf input3.pdf
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