Fully licensed and certified software Dolby Pro Logic II matrix surround encoder and decoder. Multi-platform, multi-instances version with all formats on one iLok license, Platform: ProTools RTAS Plug-in (Win/Mac), VST Plug-in (Win/Mac), Standalone version (Win/Mac) - Minimum requirement Pro Tools 7.4, VST 2.4 host, Mac OS 10.4 or Windows XP / Vista / Win 7 - iLok and iLok account required.