Can I ask about license ?

If the free and paid version of the lecture video is posted on a same commercial site,

and If anyone can watch the free version without paying

Then, is it possible to make a freevideos with a regular license ?

Which license do I need for an end product that is free, but has parts you need to pay to access?

If the item is used within the free part, the Regular License if fine. If the item is used only in a part that requires payment to access, you need the Extended License.

Example: If you were using a 3d model of a sword for a game and you could only get the sword by buying it, you’d need the Extended License. If it was the starting weapon that even non-paying users could use, all you’d need is the Regular License.