Differing national IP systems is the elephant in the room.
As 'zef' points out: none of the "official" means of purchasing legal IP works across properly borders. I've even ranted at Apple directly over some of the more Byzantine problems I've had with iTunes.
I've worked in a number of different countries over the last few years. I'm currently living in Italy, where iTunes is a pale shadow of, say, iTunes UK (or US). I can't get Doctor Who episodes—despite the fact that I can stream them now on the BBC's own iPlayer Global iPad app! Half the features touted in the US version are missing from iTunes.
Hell even the iBookstore in Italy is stuck in the "Gutenberg Project public domain catalogue" era: there is *NOTHING* in there aside from the "classics". (I.e. proto-Mills & Boon fare written by Jane Austen and her peers, which are considered Literature primarily because they're old. If they'd been published today, they'd be considered basic romance novels.)
And it's not just Apple, either. Spotify is a mess. Amazon Italia only just opened its doors here a few months ago and is still playing catch-up with its older siblings.
The problem is that Italian tourists aren't banned from buying music CDs, DVDs or anything else in the UK. So why am I banned from doing the *exact same thing* online? What difference does it make if I want to buy a DVD in English without Italian subtitles or dubbing?
In short: why the hell does the IP industry go so far out of its bloody-minded way to make it as hard as possible for people to pay them for their products and services?
Here I am, an ex-pat Brit living in a foreign nation, but as far as these idiots are concerned, I don't exist. Despite the fact that I have relatives who were speaking *seven* languages before they left school, the automatic assumption is that all the world's citizens are like at least half of those who live in the US: parochial, mono-lingual and uninterested in other cultures.
I *want* to give artists my money, but their agents won't LET me!
The interviewee in this article is bang-on. I hope rather more people listen to him than to that idiot Lessig.