IGN reports that Capcom is currently testing new DRM protection on Final Fight: Double Impact via PlayStation Network in an effort to combat PSN GameSharing.
It is important to note, however, that the game only requires one initial check at at start-up. Once the game has loaded, it appears you can then sign out of PSN.
To quote: "He later discovered Final Fight: Double Impact can only be played on the same account it was purchased on.
Capcom issued a response to his concern, according to his message post, saying this move was done in an effort to combat "rampant" game sharing on PlayStation Network but emphasized this may not be implemented on all future titles.
"Yes, there is DRM. This was employed to combat the rampant 'PSN Sharing' that has been going on over the last year," a representative wrote to nacthenud. "We're sorry that your family cannot play the game on their individual accounts (same console). This is a limitation of the Sony network."
"We are not committed to do this with all titles moving forward but the only way to evaluate impact was to try it with one title first."
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