Actually HBO has been sending DD 5.1 with some of its HD content for at least a couple of years now.
Their showing of "The Matrix" in May 2001 was DD 5.1, for example.
I did a brief press release search. I don't know why I thought HBO launched DD5.1 in January. According to press releases from Dolby and Time Warner, HBO HDTV's first ever Dolby Digital 5.1 broadcast was July 14, 2001 (Perfect Storm).
That said, I do have a HBO HDTV recording of The Matrix, and it is not DD5.1. It is DD2.0.
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