Selenium Node Licence

The startup message after recent upgrade reads as follows:

No licence specified.  Please obtain a licence and enter it on the Selenium preference page in order to use the Selenium Nodes.

Please let me know as to why this message after recent update and how I go about it.  

Dear SridharVenu,

the message is a reminder that for the Selenium Nodes usage you require a licence. All information is given in the corresponding preferences page. Free licences for evaluation are available for a trial period of one month; yearly licenses can be purchased on the website.

-- Philipp