'Return True if the APP1 segment at *offset* in *stream* is NOT an
Exif segment, as determined by the ``\'Exif\'`` signature at
offset 2 in the segment.'

@classmethod
def _is_non_Exif_APP1_segment(cls, stream, offset):

    stream.seek((offset + 2))
    exif_signature = stream.read(6)
    return (exif_signature != 'Exif\x00\x00')
