Attached Link: http://www.ranum.com/fun/weirdness/donegan.html

Remember when Marcus Ranum had his pictures stolen by Euan Donegan?  An interesting story on copyright violations.   A number of pictures were stolen from other renderosity members too.  But like you said, copyright logo's are a big risk and not enough.  Your pictures still can get stolen and you won't know about it unless its found.   See Marcus Story on the attached link..   Aloha....Errol