consider licensing the videos separately from the code in your videos. the creative commons family is a nice choice for artwork, but (stackoverflow has shown) perhaps not the best choice for code.

for code that simply showcases features of a programming language, such as the "args / kwargs" video, that's not copyrightable because it's not a novel application, but it may come into play for the more advanced topics.

really great project, by the way. i can see myself using and recommending this. your site brings to mind khan academy, which got me through three semesters of calculus.