I lost my spyware doctor CD key?

I recently brought my spyware doctor it was said to be one of the best anti-virus program ever. But before i install it i would like my brother to have it as well as it is for up to 3 users. But my 2 year old baby sister tore it to pieces and the cd key on the envelope went missing. I thought wouldnt the cd it self be useless if i dont have the cdkey, is there any way i could get the cd key? please help me?

call the company, go on the website, or check ur email for it. Also, u could email the company.
worst comes to worst- buy a new one.

Spyware Doctor 6