You don't have any right to redistribute it. You cannot email it to one friend or post it on the forum for many. When you download it you agree to the license:
http://www.contentparadise.com/us/user/green_sea_turtle_product_25832D. You
cannot sell, resell, distribute, cause to be distributed, or allow any portion of the Restricted Content to be distributed under any circumstances, via any public or private medium, except where expressly permitted by this EULA and US copyright law, without the Company's prior written consent, a copy of which must be furnished with all Restricted Content distributed in accordance with this section. You may only use the Restricted Content for exclusive use on one computer unless authorized within this EULA and/or the contents of the Company's official written consent.
It's four dollars at the link.
If you want to post your .tgo, before you zip it up, replace the turtle with a dummy object, like a sphere or box, so that anyone who also owns the right to use the turtle can dl the .tgo and replace the dummy object with the turtle once they get it.