If the original owner registered the 600 with the Sony Reader Store, then s/he needs to unregister it while it is attached to the computer--I think. If the original owner failed to do that, then it is too late since they no longer have the 600. However, I forgot to unregister a 600 I sold but was able to call Sony Support and have them do it. So at worst you might have to get the original owner to call Sony Support and have them unregister it.
Having said all that, the original owner may not have registered it with the Sony Reader Store. Some people use calibre instead. I would first try to register the 600 for use in the Sony Reader Store, and if that failed I would next call Sony Support, and if that failed as a last resort I would contact the original owner.
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