Open Circular is an agile framework for delivering working software for organisations and companies.
You are most welcome to use the Open Circular Framework in your company and organisation. You do not need a license and you do not need to pay a fee.
You can alter the Open Circular Framework as you wish, the only requirement is that you share it using the same license: Creative Commons BY-SA.
Do only implement the Open Circular Framework without adaption to your organisational structure and situation, if you have no better alternative.
Lastly, remember the Open Circular Framework is the foundation for a conversation with the stakeholders in your organisation regarding how to deliver working software in a smarter way.