A very bare-bones PDF metadata-clobberer Python script.

strip-pdf-metadata.py

#!/usr/bin/env python
# encoding: utf-8
"""
strip-pdf-metadata.py

Created by FI$H 2000 on 2012-01-17.
Copyright (c) 2012 Objects In Space And Time, LLC. All rights reserved.

See also:

    http://stackoverflow.com/questions/2574676/change-metadata-of-pdf-file-with-pypdf
    http://two.pairlist.net/pipermail/reportlab-users/2009-November/009033.html
    http://pybrary.net/pyPdf/

"""

import sys
import os

from pyPdf import PdfFileWriter, PdfFileReader
from pyPdf.generic import NameObject, createStringObject

def main():
    OUTPUT = 'document-sanitized.pdf'
    INPUTS = ['document.pdf',]

    # There is no interface through pyPDF with which to set this other then getting
    # your hands dirty like so:
    
    output = PdfFileWriter()
    
    infoDict = output._info.getObject()
    infoDict.update({
        NameObject('/Title'): createStringObject(u'title'),
        NameObject('/Author'): createStringObject(u'author'),
        NameObject('/Subject'): createStringObject(u'subject'),
        NameObject('/Creator'): createStringObject(u'a script')
    })

    inputs = [PdfFileReader(file(i, "rb")) for i in INPUTS]
    for input in inputs:
        for page in range(input.getNumPages()):
            output.addPage(input.getPage(page))

    outputStream = file(OUTPUT, 'wb')
    output.write(outputStream)
    outputStream.close()


if __name__ == '__main__':
    main()