Those images have been fetched from external servers. They are *not* covered by Plat/al's GPL license.
Please check with image owners for more information on copyrights and utilization limitations.

add-google.gif:          http://gmodules.com/ig/images/plus_google.gif
add-google-calendar.gif: http://www.google.com/calendar/images/ext/gc_button1.gif
add-netvibes.gif:        http://www.netvibes.com/img/add2netvibes.gif
add-yahoo:               http://us.i1.yimg.com/us.yimg.com/i/us/my/addtomyyahoo4.gif