Re:What is Apple dominant in? (Score 2, Informative)

Let's assume for the sake of argument that Apple is not only dominant, but has a monopoly in the music download market. According to U.S. antitrust law, it is not illegal to gain a monopoly in a market segment if you do it through legitimate market forces, such as selling a really good product that the public really wants to buy. But once you are a monopoly in that market segment, you cannot use the power you now have as a monopoly to exert undue influence in other market segments. This was the crux of the antitrust suite against Microsoft. The findings of fact determined that they were a monopoly in operating systems, and that was OK. But they used the monopoly power to exert illegal influence in the web browser market (Doesn't that seem like such ancient history now?).

So, by my argument, where has Apple done anything illegal by not licensing Fairplay? Of course, French and/or EU antitrust law may have more restrictive definitions. Apple's stance may also backfire on them in the end, but that would be another example of market forces making the determination.