#!/usr/bin/env python3

import sys
import os
import piexif

assert len(sys.argv) >= 3, "Usage {} CREATOR FILENAMES...".format(sys.argv[0])
creator = sys.argv[1]
filenames = sys.argv[2:]

for filename in filenames:
    assert os.path.isfile(filename)
    exifDict = piexif.load(filename)
    exifDict['0th'][piexif.ImageIFD.Copyright] = creator.encode()
    exifBytes = piexif.dump(exifDict)
    piexif.insert(exifBytes, filename)