DCV filename extension is associated with Drive Crypt, a disk encryption software developed for Microsoft Windows. Drive Crypt encrypts disk data and creates a disk image.

DCV files contain information related to encrypted disk data in the form of a disk image. Encryption and decryption processes are performed on-the-fly, which means that reading data from DCV image is a two-stage process, comprised of data decryption and memory write. Encryption is analogous – data is loaded to the memory before encryption and then written to DCV image.