METADATA

exiftool

tool to change file metadata , not only media metadata

sudo apt install libimage-exiftool-perl

zeer goede doucmentatie : https://adamtheautomator.com/exiftool/
https://exiftool.org/#supported site werkt niet meer
exiftool

example

# chang the metadata tag  "Producer"  to the value "OpenPDF 1.0.5" for the file xyz.pdf
# use double quotes if string contains spaces
exiftool -Producer="OpenPDF 1.0.5"  xyz.pdf