It seems to me that this actually makes transferring sold tickets more convenient. If you have a smart phone, and the buyer has a smart phone, you can forward the ticket to them and they can use the E ticket on their phone to be scanned at the gate to gain entry. Much more secure for all parties. A printed PDF of a ticket can be duplicated, so someone could sell you a ticket that someone else has already used and there's absolutely no recourse.

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