http://en.ifaqticketing.uefa.com/uefaeuro2012/questions/56-will-the-tickets-be-personalised
Will the tickets be personalised?
According to the ticketing terms and conditions, the ticketing system in place for UEFA EURO 2012 allows us to track which individual is making use of each ticket. During the application process, UEFA only collects the personal data of the applicant. However, on request, applicants must provide UEFA
with full details (including the name and address) of their guests. If
an applicant refuses to provide such details on request, UEFA
reserves the right to cancel their ticket allocation or, if necessary,
refuse the applicant and their guests entry to the stadium, with no
right to a refund. The relevant tickets will be cancelled.