The end result is the same (cracked movie) and it could just be down to boasting rights: Gizmodo reports that HD DVD and Blu-ray have been cracked again. This time, WinDVD 8 has been exploited to find the 'sub device key'.
Yes, yes, very clever. Just another way to crack high definition disc copy protection.

From: Sony to double BRAVIA LCD TV production for growing European demand