def decrypt(self, key, filename):
    outFile = os.path.join(os.path.dirname(filename),
                           os.path.basename(filename).replace("(Secured)", ""))
    print(outFile)
    chunksize = 128 * 1024
    with open(filename, "rb") as infile:
        filesize = infile.read(16)
        IV = infile.read(16)
        decryptor = AES.new(key, AES.MODE_CBC, IV)

        with open(outFile, "wb") as outfile:
            while True:
                chunk = infile.read(chunksize)
                if len(chunk) == 0:
                    break
                outfile.write(decryptor.decrypt(chunk))
            outfile.truncate(int(filesize))
    return outFile