Licensing

Hello Everyone. I have a question about licensing with PostgeSQL.

I work for a small company and we design websites for customers of ours. I read the license that is listed here.

https://www.postgresql.org/about/licence/ <https://www.postgresql.org/about/licence/>

However, I am still confused.

The small company I work for develops websites and applications on AWS EC2 instances for our customers and we charge the customers a fee for hosting and for maintaining their websites.

I am trying to figure out which dbase software I can use and if I need to buy licenses or not.

We do not modify the PostgreSQL code and we do not redistribute the binaries. So far we are just running on a single instance for each of our customers, but we are not utilizing anything like a cluster or high availability CDN, other than what AWS EC2 provides. We always utilize Wordpress and Drupal for site front-end.

Can someone tell me if I am able to use PostgreSQL for the small company I work for? Is there a way to by a commercial license of PostgreSQL if we are required too?

Thanks