You will have to buy another copy. If you read the EULA carefully, you'll see that it's only one copy per PC. Also when playing online the ORIGINAL DVD and CDKEY(serial number) are required. The servers are doing a check for file integrity and the cracks are modified files. So the cracks are considered by the server as hacked files which will make the game to disconnect and you may lose your online account in most of the cases.
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