It seems like you might be referring to "SDC" as "Standard Digital Coder" or "Digital Private Cloud" (DPC), which is a type of VPN service that connects to a secure cloud storage service. However, "SDC" alone does not stand for anything specific in this context. If you're asking about a VPN service that connects to a DPC or similar SDC, it would be a VPN that integrates with a secure cloud storage service like DPC, Bitly, or others. Such VPNs are often referred to as "SDC VPNs" or "Digital Private Cloud VPNs."