Similar to EA's Online Pass and following the trend of many other publishers, Sony has announced a new Playstation Network Pass program, starting with Resistance 3.
Like EA's Online Pass, players who buy a new copy of certain Sony titles will have a single use code to allow them access to online services. However, if you don't have the code (like if you bought the game used), you'll have to pay money for a new pass.
The system is obviously for combating used game sales, which we've seen through many methods (such as a recent crop of undeletable 3DS save games and of course other companies, like EA, using using either online passes (such as in their sports games) or access to premium content (such as BioWare games like Mass Effect 2 and Dragon Age 2)).
Do not fret though, as this is not a forced norm. Sony said in their statement that "This program will be game-specific. Games that are a part of this program will include a single-use registration code that grants the account holder redeeming the code full online access for that title."
Fortunately, you will probably only be seeing this on future Sony titles (I'm guessing Uncharted 3, for instance) and old ones won't be affected.[/p]