Yes you are exactly right, there is no license file that has to be transfered over and you have to do absolutely nothing for your license to take affect. This seemed strange to me at first too. Symantec trusts people not to take advantage of this sort of system : )
Cheers,
Grant-
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We are trying to remind people to make sure to click on Mark As Solution when one of the posts answers your question. This lets us know you do not need further assistance, as well as making life easier for people who may have the same problem as you do. Thanks.