Question NFS MW Activation key

[StoneGuard]

I am looking at buying Need for speed Most wanted 2005 for PC on Ebay or something but my question is if the activation key was used by the previous owner can i still use it?

 

[USAFRet]

I am looking at buying Need for speed Most wanted 2005 for PC on Ebay or something but my question is if the activation key was used by the previous owner can i still use it?

Why would you think a key that is previously and currently being used, is good for you to use?

 

[StoneGuard]

I dont. i just want to know if i can use the key after it was used or it is a one use thing