Fine print is below, looks like Nissan will own the rights to anything you submit:

Grant of Usage Rights in Submissions:

By entering your Submission into the Innovation Garage, you grant to Nissan an irrevocable, perpetual, transferable, non-exclusive, fully-paid, worldwide, license (sub-licensable through multiple tiers) to (a) use, copy, transmit, distribute, reproduce, modify, create derivative works, adapt, combine with other ideas or works, publish, translate, publicly perform, and publicly display your Innovation Garage Submission (or any modification thereto), in whole or in part, in any format or medium now known or later developed and (b) use (and permit others to use) your Innovation Garage Submission in any manner and for any purpose (including, without limitation, commercial purposes) that Nissan deems appropriate in its sole discretion (including, without limitation, to incorporate your Innovation Garage Submission or any modification thereto, in whole or in part, into any vehicle, technology, product, or service).