code: def _is_non_Exif_APP1_segment(cls, stream, offset):
          
          stream.seek(offset+2)
          exif_signature = stream.read(6)
          return exif_signature != b'Exif\x00\x00'
docs: Return True if the APP1 segment at *offset* in *stream* is NOT an
          Exif segment, as determined by the ``'Exif\x00\x00'`` signature at
          offset 2 in the segment.