I think copy protected styles will work as long as there is a "limited" public wanting them. If too many people want them, they may search for cheaper alternatives, and someone will crack the protection, no matter how difficult.

Actually, i believe that some proficient fellows can study, crack and take apart any manufacturers' operating system and samples and copy them, alter them and distribute them and so on, even make an emulator, (imagine an 76 keys midi controller with programmable buttons, set up to mimic a Tyros, sending signals to a Tyros emulator in a laptop), but the customers just aren't there. Yamaha's samples may interest, i don't know, maybe 100-200 persons, when a cracked application or game will interest thousands.

And keep in mind that the "trickle down" of the T4 styles to older arrangers, will actually act as an advertisement, for the latest and greatest. Yamaha doesn't lose money from musician X who has "borrowed"a handful of T4 styles and plays them on his S910, since musician X would never fork out the money to buy a T4 in the first place.