Toshiba has announced a delay to the launch of its HD DVD players until the first quarter of next year, a move that may see the technology hit the market at around the same time as Sony's rival Blu-ray system.

The delay stems from issues with the Advanced Access Content System (AACS) digital rights management software being used on the discs.

This system is designed to limit users' ability to copy HD DVDs but allow content to be shared among among different terminals on a home network.

"Various industry participants are in the process of finalising the details for implementation of AACS," said Toshiba in a statement.

"Because the DVD Forum has adopted AACS as an integral part of the HD DVD format, Toshiba will launch its HD DVD products only after AACS is finalised."

Under these circumstances, Toshiba plans to launch HD DVD players and notebook PCs with HD DVD drives in Japan following the implementation of AACS into hardware and software products.

The company added that it will also take into consideration the optimum timing for marketing hardware and software.

Toshiba's move may be linked to HP's decision to hold off on supporting the rival Blu-ray because of problems with the DRM technology. 

Microsoft and Intel, which are also pushing these home entertainment networks, are supporting the HD DVD standard.