
qpdf: error with job-json file bad-json-encrypt-no-key-length.json: exactly one of 40bit, 128bit, or 256bit must be given; an empty dictionary may be supplied for one of them to set the key length without imposing any restrictions
Run qpdf --job-json-help for information on the file format.

For help:
  qpdf --help=usage       usage information
  qpdf --help=topic       help on a topic
  qpdf --help=--option    help on an option
  qpdf --help             general help and a topic list

