Dippylulu has the right idea; too bad this can't be circulated worldwide. I love the other cards in the series as well. Stop by her shop and show your support in believing that plagiarizing is BAD!
When I was in school, I wrote on a discussion board about plagiarizing. There was someone in one of my classes that was copying my work word-for-word and calling it her own. She was kicked out of school as she was doing this to a number of people.
If you want to know about creative commons licensing and the "RULES", visit the Creative Commons FAQ page. My argument to all this is can you prove when the idea was born?