More accurate OCR would recognise the images have no text

  $ touch temp.pl; perl temp.pl; echo "exit code $?"
  exit code 0

which is a valid perl program. And that one image with the watermark "stitch & shutter" ?

  $ echo "stitch & shutter" > temp.pl; perl temp.pl; echo "exit code $?"
  exit code 0

Also valid perl.