Is Strapi open-source?

Hi Strapi team!

I’m confused about Strapi license. I see in the official Strapi website, it defined is a open-source. But as i see, Strapi have a Enterprise license. Is it conflict? And how Strapi unlock more futures by a valid license (such as: hardcode the license checking rule in the source code, or have two repositories: one for open source and another for enterprise…).

Please help to explain. Thank.