DDoS (Distribiuted Denegation of Service) consists in launch various DoS attacks to same target from different computers.
DoS (Denegation of Service) consists in send a lot of request to a destination untill it can't handle them and explodes (it must explode, otherwise isn't cool).
In any case, if you care to know what is and implies the DDOS, remember that if a complaint is made may be called by the legal authorities of your country. Also, I'm not sure, but I think that BP has adopted a DDOS protection systems.