Every time I hear about a gamer having problems with a game they've bought because of an excessively aggressive DRM system, I cry a little. Inwardly of course, so people don't think I'm some sort of weirdo. Sadly, many user are having problems with BioShock, having bought the game and not being able to play it while they wait for it to be activated (before you can play it you need to activate it over the Internet). There's also a lot of reports of people having problems reinstalling or putting it on other machines.
For people having problems or people considering buying BioShock, I've written a brief article
about the problem and looked at the issues of DRM in games in general, which might be of interest.
Update: Contrary to some unfortunately popular belief, BioShock does not have
a rootkit. This rumour was spread by some blog site, the author admitting he added the dreaded 'r' word to increase Google rankings.