Can I? I heard you can share your downloaded games with 5 people or whatever, so I wondered it this applied to betas/demoes.

If so, anyone want to give me access to the MAG beta for the BFBC2 beta?

usually betas cannot be shared, and can only be active on a single account every 24 hours.

Unless specifically state, probably not since they give you a unique code.

No, Beta cannot be shared.

It will result in saying to the original owner "Beta has been played on another PS3, please wait 24 hours until play again" Something like that. Pissed me off, not gonna share again.

Not normally.

Some betas do allow it, but you will need to look at their licenses to be sure, and if they don't explicitly say you can do so then you must assume that you cannot.