Well, it basically means following two:
1. Someone who plays on server you try connect uses same CDKey as you
2. Last time your game crashed, you are still "active" on server, just wait 90seconds till server realizes you are gone and try to connect
Reason in detail: if your game crashes, it doesn't send a packet to server, that you disconnected and server still thinks you are playing, if server finds out your old "you" didn't send any data for 90s or 50.6s (varies on server), it removes your old you using your CDKey and you can connect again, as nobody using same CDKey is already online :D
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