Quite correct Nuno,
The worldwide copyright and intellectual property rights are owned by MTV Networks, a division of Viacom International, Inc.
Even the use of the brand / trademark name "Spongebob" for advertising without specific written permission is a federal crime.All site software, design, text, images, photographs, illustrations, audio clips, video clips, artwork, graphic material, or other copyrightable elements,names, brands and the selection and arrangements thereof, and trademarks, service marks and trade names (the "Material") are the property of Viacom and/or its subsidiaries, affiliates, assigns, licensors or other respective owners and are protected, without limitation, pursuant to U.S. and foreign copyright and trademark laws.
best wishes
Dave