EZ-D is a new DVD-Video-compatible optical disc developed by a company called Flexplay.
They're (or should be -- currently, 09/2003, there are no official reports on discs' compatibility issues) fully compatible with DVD-Video specs, but differ from traditional DVD-Video discs because their dye is made in such way that once opened from airtight container, discs will turn into black within 48hrs and become unreadable by DVD players. Thus, discs are being called as disposable DVDs. Currently (09/2003) Disney is running trials with these discs -- read our news story from here.