sso with kerberos with ABAP

Dear Gurus

We are planning to use kerberos authentication SSO mechanism from Windows desktop where SAP gui (740) installed ,  to the SAP ERP servers ECC EHP7 installed on (PAS -HP-Ux) and all Apps on Linux server.

could you plsease shed some light on it. whether this solution is still acceptable,

is there any documentation for it.  and SSO2.0 reuires any license from SAP.

Thanks in advance