CD and DVD writers usually include the serial number of the DVD or CD writer onto the CD/DVDs they write. Theoretically, if intercepted, the entire supply chain could be tracked down to trace the purchase of the CD/DVD writer to you. If you think there are financial records traceable to you, and your adversary has the will/capacity to be this thorough, avoid this method if interception is a high likelihood. Such interception and tracing is very expensive, so keep that in mind when weighing your chances.