The freeware VivoActive Player will give you an idea of the possibilities that exist with Vivo's technology, but to realize its true potential you'll need to purchase the commercial PowerPlayer client ($12.95). In addition to letting you save Vivo content, the PowerPlayer uses the proprietary H.263 video codec for enhanced video and Vivo's SIREN technology for high-fidelity audio.
The freeware player is also limited by the lack of playback controls and program settings, whereas the PowerPlayer delivers an intuitive interface with playback controls, download status, content information, and an option for viewing video content double-size (twice its original size). All in all, $12.95 is a small price to pay for the PowerPlayer's more advanced feature-set.