4. How You Can Share the Licensed Content When It Isn’t Part of a Project
Except as otherwise stated in the Service-Specific Terms (as defined in Section 7), you may not Distribute Licensed Content in source format to third parties except to employees, affiliates, and contractors who are utilizing the Licensed Content in good faith to develop a Project on your behalf. Those employees, affiliates, and contractors you share Licensed Content with are not permitted to further Distribute the Licensed Content (including as incorporated in a Project) and must delete the Licensed Content once it is no longer needed for developing a Project on your behalf. You are responsible for ensuring that any employees, affiliates, or contractors you share Licensed Content with comply with the terms of this Agreement.
So yes you can share content, in good faith, as long as it’s part of the project in hand.
Well you really need to read the entire agreement for the details but over all purchased content is bound to the needs of the project “in good faith” and as to fair use.
If Bob joins the team and has a collection of purchased motion capture files he can contribute the animations as part of the project, say building a movement system, as to “needs” of the project in hand.