The Dependency Validation Service library (libDVS) is a stand-alone version of Noja's dependency model, a generic service to efficiently track and reason about dependencies in packetized multimedia bitstreams. It allows you to estimate the importance of data units and to check the integrity of bitstreams structures. You can use libDVS in your own streaming protocols, streaming servers and proxy applications to decide about the value of data units and to implement on-the-fly bitstream adaptation engines.