Hi Kousik,
No that software is not genuine. They are selling Volume licence licences. The software may activate, it may not. Either way, within a month the software will de-activate and require re-arming.
That software is meant for use in a company or organisation, where the software will be re-armed form the ocmpay activation server on a regular basis and you will not be able to do that.
Honestly you will be wasting your money and have to purchase the software again anyway . . .
The old addage - 'If it sounds too good to be true - it generally is!'