By installing VA-8000 in a PC, the user can build a remote surveillance system that links DVRs and the PC via a LAN. In addition to setting up each recorder, recording, retrieval, playback and live surveillance options are available. Moreover, up to 4000 DVRs in a network can be controlled by the PC. Complete security is provided by ID-password protection with four levels of accessiblity. In addition, the software features a fuction that verifies the authenticity of data by detecting any alteration made to recorded images.