Once your capstone is completed, it will remain your intellectual property. If you are doing your capstone work at a company/organization, then any work completed needs to be reviewed by their legal department before it becomes your intellectual property. As a matter of course, the Extension School does not sign Confidentiality Disclosure Agreements (CDAs) and typically projects are not given approval if company/organization claims intellectual property rights to your work.
For more information, please see the Harvard Library Copyright Advisor program webpage. Under the "publishing and licensing" section, there is an eight-minute video that explains why scholarly research needs to be public domain.