In this new version of pdfid.py, a new option was added: -n.
With this option, you can suppress output for names with a count of zero:
pdfid_v0_2_3.zip (https)
MD5: 65966E8BBF932D3C0830B755FDE094FE
SHA256: 9482176D173EFA6F2F33EE409B091BFA45685FC285B87F7219A4E9418B47F739
Didier Stevens 