Selling patterns

Does anyone know if you have to get a business license to sell knitting patterns online or start an shop like on etsy?

Thank you.

This may help and I’m sure others who sell on Etsy will have something to say.

I’ve also seen this site recommended:http://www.sba.gov/
It may be best to check with your local chamber of commerce as it seems the rules may change from state to state and even within a state.
I assume your selling your own patterns? You may want to investigate copyrights as well.

Thank u!