A good friend of mine has a VBD e-certificate that it is about to expire and she doesn't plan to use. She has offerered to give me the certificate since she knows i am looking for a cheap fare for an upcoming vacation. I am not giving her any money in exchange as we are good friends. I am wondering that even though this certificates are not transferrables, I could use them to pay for my fare using co.com. Any risks involved? Thanks!