I bought a legal copy of Britannica 2002 back in that year. Just for fun I concocted some serial numbers other than the one pasted on the cover, and some of them worked ! These people need to work on their security code.
I reported the matter to the Indian branch but did not receive a reply. The parent website is
www.britannica.com and the Indian site is
www.britannicaindia.com.
Make sure you type the name with a single 't' instead of a double t, otherwise you'll end up at an entirely different website.
I remember making that mistake several years ago. It seemed someone - not the true Britannica people - had created that website (with a double t) partly as a joke. He/they pointed out the spelling mistake and also brought up some factual errors in the content of the encyclopaedia.
I've made a quick visit to that site just now and it seems the contents are entirely different now.