Unlicensed code does not grant permission to use, in fact it's the exact opposite. The server is not pushing the source to you so that you can take it and use

Unlicensed code does not grant permission to use, in fact it's the exact opposite. The server is not pushing the source to you so that you can take it and use it in your own projects. It's pushing the source because that's how the browser will run the program. Of course you CAN take and use the code. But you MAY not.