"ocaalert.png" and "ocainfo.png" were based on "ocainfoset.png", which
was obtained originally from:

      http://openclipart.org/people/kuba/\
kuba_information_icons_set.svg

Note: This URL was valid as of early 2007. However, it may have broken
since then.

The  original creator was Jakub Jankiewicz.  According  to information
available at "openclipart.org" in 2007,  the original image file is in
the public domain.