Thanks for getting Doodle Assets Kit! You are free to use all the assets in that package on as many of your own projects as you want. But, if you intend to use these assets to create videos for other businesses or clients (as a service)… than you need a “Developer” License for that…
Here’s Why You NEED The Developer License:
Video creation services are in high demand and businesses are willing to pay $497 – $1697 or more per custom video! With a Developer License you’ll be able to create videos for others for hundreds of dollars a pop.