linux 
exiftool -all= -overwrite_original example.pdf
mv example.pdf temp.pdf
qpdf --linearize temp.pdf example.pdf

windows
exiftool -overwrite_original -all:all="" %1
qpdf --pages %1 1-z -- --empty output.pdf
REM qpdf --linearize %1 output.pdf
move output.pdf %1
REM pause