Nintendo's DS has been plagued this generation in terms of piracy - take a look at the kids with DSs on your next train journey, and we guarantee you'll find at least one with a card used to pirate DS games. Instead of making those caught walk the plank, Nintendo have undergone many lawsuits and court cases against the manufacturers, and distrubtors of the pirate cards - but even this has done little to prevent piracy.
So it comes as no surprise that for the 3DS, Nintendo have tried to come up with more advanced anti-piracy measures - which they say are so sophisticated, they're too complicated for our puny, non-technical brains to comprehend. Whether the technology really is that complicated or not, Nintendo would be unlikely to want to explain how it works, for fear of giving the pirates a head start - but it looks like if you want to play games on your 3DS, you're going to have to pay for them. And that can only be a good thing for the industry as a whole.