The credit card 'Da Vinci Code'

[bionicarm]

This is for all you mathematicians out there. Never knew there was a 'code' imbedded in my credit card number that validates whether the number is good or not:
http://articles.moneycentral.msn.com...de.aspx?page=1

 

[stdreb27]

yes, what is really cool are the algorithms they use for software licensing...