How to use the 'Username' filed's value in form level scripting?

[Arjun_Venugopal]

Hi,

    I have applied the Rights Management for a form. I wanted to use the 'Username' field's value, which is present in below image for the form side scripting. How can we get this value? Any script is there to extract this value in the form?

Thanks in advance,

Arjun