Apple and supporters of the non-proprietary MPEG-4 standard for digital media have developed digital-rights management (DRM) and encryption features for the technology, reports CNet.

These features are designed to prevent media being shared against copyright holders' interests. Microsoft is also pushing its DRM solutions for Windows Media 9.

MPEG-4 developers are lobbying digital-media body Internet Streaming Media Alliance (ISMA) to set an industry-wide DRM standard by June.

Industry watcher say that proponents of MPEG-4 need to bring DRM into the technology, else the market will adopt Microsoft's proprietary solution.