The Coral Consortium was founded in 2004 by Hewlett-Packard Corporation, InterTrust Technologies, Koninklijke Philips Electronics N.V., Matsushita Electric Industrial Co., Ltd. (Panasonic), Samsung Electronics Co., Ltd, Sony Corporation and Twentieth Century Fox Film Corp.
Coral proposes an architecture whereby devices using different DRM technologies are able to join a Domain that allows them to exchange protected content securely.
In theory this should greatly ease the portability of protected media files between devices.
[1] Much of the Coral documentation requires the reader to agree to legal conditions, so it is not very easy for most members of the public to examine the proposals.
While Coral is a novel approach to DRM interoperability, doubts have been raised in some quarters as to whether it is really suitable for all media types.