These samples were made by volunteers for sharing knowledges and informations with more persons about DOM of Mozilla.
And it's free to use and change all of these samples for not only personal sites, and business ones. Also, anyone can link to this samples freely, it's for informing more persons about DOM of Mozilla.
But, these rules don't force each writters to renounce copyrights of samples. You must ask them about permission to distribute like books and sample sites.
1. Kintoto - happy-go-lucky goldfishes - (IE4+,NN4+)