Reading the Add-Ons introduction we find this titbit: "You can share add-ons you create by submitting them to the File Exchange at MATLAB Central."
Following that link we end up on the introduction page to File Exchange. Click the link "About File Exchange" (left-hand side, hiding under the blue "Submit a File" button). On the right towards the top is a box with the text "Your use of File Exchange is subject to the MATLAB Central Terms of Use."... follow the link: about halfway down the page is a section entitled "File Exchange". Here is stated:
"All new submissions of Content posted by Site users will be licensed under the BSD license. Submissions of Content posted by MathWorks will be licensed under the BSD license or the MathWorks Limited License."
