I have using angular material for quite few days. Now I am planning to develop a commercial software using angular material (https://material.angularjs.org/). While going through the license section of the product (https://material.angularjs.org/latest/license) it says -
"The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software."
I am not getting the meaning of the above statement. Does it mean that some/all of my source code should have the above license as well (Whereas my product license will definitely be proprietary) ?