If credit isn't required, then why does it have a CC-BY-SA license? :P Nice work on this though. Looks really nice.

i just put these CC-BY-SA cuz they are the only license i know if there is a license that dont require credits then which one is it ??

If you want to allow people to do everything they want with your blend you can use CC-0. This way you don't claim copyrights on your work and it can be used for every purpose (even commercial) without the need of attribution. You can read about Licenses [here] (http://www.blendswap.com/page/licenses) and further informations are provided at the links to each license model.