I covered Copia back at CES, so I wasn't going to post about it again. But with the recent Google Buzz debacle, I was curious about whether they considered how they might avoid the situation. As it turns out, they were a couple steps ahead of me.
The Copia developers already understand the problem of unlimited sharing. In fact, they were worried about the possible negative aspects of sharing the books you read in, for example, Iran. They've already planned worked out how to avoid oversharing and built constraints into their software.