You know what's great? Those annoying DMCA flags aren't just limited to search engines and internet media content, those annoying pieces of crap can extend to digital video game distribution as well, which is why Grand Theft Auto: Vice City is no longer available on Steam right now.
If you already bought your digital copy of the game through Steam you'll still be able to download and install the game, but you can no longerbuythe game.
The story originally surfaced on the Sixth Axis, and speculation ran rampant amongst users that perhaps the game was no longer available due to the release of the game on iOS. However, it's much more nefarious than that.
Update: Looks like the block is from Sony Music Entertainment with the claim on a song from Michael Jackson called 'Wanna be Startin' Something' from Vice City's Fever 105 station. The content from SME and Warner Chappell has blocked the content on copyright grounds.