The Blu-ray group is being investigated by the DoJ. Not much information is available, but the source indicates that the investigations relate to the actions of the Blu-ray group members that were also members of the DVD Forum, which elected the competing HD-DVD format over Blue-ray to be the next generation optical media. It has been suggested that the members of the Blue-ray group might have been co-operating in the DVD Forum in order to stall the development process of the HD-DVD.
The investigation is looking to determine whether the group's members potentially acted in concert to impede the technical progress of the DVD Forum, which has a competing high definition DVD format called HD-DVD.Source: IGN
The Forum approved HD-DVD over Blu-ray as the next-generation format to succeed the DVD format. The DVD Forum is a consortium of consumer electronics firms that was created to help facilitate the DVD specification, and all of the participants in the Blu-ray effort are Forum members. HD-DVD was developed by Toshiba and NEC and was originally known as AOD, or advanced optical disc.