I wouldn't worry too much about these technologies gaining much market share. As others have pointed out, they work by exploiting audio CD players' general ability to work around errors on the CD and try to play through it (versus a CD-ROM drive's general desire to report "correct" bits).

Unfortunately for the purveyors of these new audio CD formats, many consumer audio CD players aren't so good about decoding these funky new CDs. Imagine what would happen if a major pop star released an album that 10% of the general population wasn't able to listen to on their pre-existing consumer equipment. Mayhem!

Furthermore, if this technology ever became more widespread, you could certainly imagine that CD-ROM drive vendors, the ones currently advertising how great they are at digital audio extraction, will simply release new drives that work just fine.

As to SDMI stuff, well, most of you know how I feel on that subject.