Ready API Protection server vs on on premises license-server

Azhar1 - I am assuming this question relates to a floating license(s)?

To use an ID-based floating license offline you only need to install the On-Premise SmartBear License Manger. To do that
Download - https://support.smartbear.com/slm/downloads/  

Install - https://support.smartbear.com/licensing/docs/activate-and-use/private-networks/onprem-license-server/setup/index.html  
Add licenses - https://support.smartbear.com/licensing/docs/activate-and-use/private-networks/onprem-license-server/add-license.html  

To use the licenses from ReadyAPI - https://support.smartbear.com/readyapi/docs/general-info/licensing/id-based/private-networks/index.html