Convert PDF to ... PDF

I keep running into people having issues with PDF files. Most of the times there's a very easy solution to fix their issues: convert the PDF to a PDF.

The following ghostscript command will successfully convert a PDF to a new PDF without any restrictions, suitable for printing, editing with PDF editors or whatever you want:
gs -dSAFER -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -dPassThroughJPEGImages=true -sOutputFile=out_file.pdf in_file.pdf.