If you're going to go along that route why even bother with it? Its only a step up from online activation, meaning you need to be connected when you play for the first time (ok a few steps but the point is there). Besides, if they can crack always on DRM, cracking 'periodic' DRM is surely even easier.
Well clearly it isn't as people still haven't cracked this form of periodic DRM.
The difference lies in the fact that with 'always on' DRM, the game has one component that looks for a connection to the server, crack this and the game is cracked. This system however relies on a series of unique prompts from the server every time something is achieved and in which order it is achieved. This is why the current workaround only allows you to play certain missions in a certain order; these are the only 'prompts' that the scene people have managed to recreate, log and build into their emulated server.
As soon as someone using this emulated server does something the scene people haven't or do it in a different order, the emulated server will fail to send out the correct prompt and the game will cease to function. In order to create a emulated server to allow for full exploration of what the game has to offer the scene people will need to do everything, in every possible order and integrate it into the emulated server. When the next game comes out with this sort of DRM, the developers can simply create a whole new set of prompts thus causing the whole process to start again.
It surely is possible to 'crack' the game in the normal manner, however again every moment a prompt kicks up this will need to be dealt with and worked around. There's probably thousands of different prompts to deal with and i can't see this happening any time soon again.
'Always on' is essentially one component of the game that needs to be cracked, this method is every event in the game.
[EDIT] Just thought i'd add, AC2 does have an 'always on' component to its DRM too, however this was cracked quite early after release, it's the rest of it that's got people stumped.
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