impossible to do. depends on what kind of reciever. new recievers such as D10, D11, D12 R15, H20, H21, H22, H23, HR20, HR21, HR22s will not.
im assuming you want to take a card and go to another reciever and plug it in?
EVERY directv reciever is married to that SN to match the Card. without authorizations from DIRECTV will NOT work.
if you had a bad card. they will re-marry a new card, which would be sent out to you VIA mail, for that SN of the reciever you are replacing the card for. Other than that, they or you cant insert another card that isnt for that reciever.