Strip away copyrighted ICC profile

While searching for embedded non-free ICC profiles:

  find . -regextype posix-extended -iregex '.*\.(jpg|png)' \
    -exec sh -c 'identify -verbose "$0" \
    | grep -i copyright && echo "$0"' {} \;

The following file showed up. The proposed alternative file just
remove the embedded usually non-free and anyway useless ICC profile:

  exiftool -icc_profile"-<=" tests/images/a-icon-1-41x41.png