DSP stands for distribution service partner. DSP's supply OEM software to resellers such as ourselves, but so do many other suppliers, who offer no guarantee that their software is not repacked, academic or not for resale. 

Only DSP software is guaranteed to be sourced directly from the manufacturer. Buycheapsoftware as a matter of course, in maintaining our 100% legally licensed guarantee, purchase solely from DSP sources or preferably, Microsoft directly. DSP software, in short, offers you as the user the certainty that what you are buying is exactly what you are paying for - Legal software as originally manufactured by Microsoft.