Hi Ratikanta,
Thank you for elaborating your use-case with us.
1- We can only read and write information written in License memory, concurrency related information is not via Read/Write API's.
2- We are not able to restrict the concurrency directly. You can generate your own tool with Admin API,s and save the information about sessions. after that you need to manually generate your own code for session restriction.
Regards,
Anubhav