Hi Bayside
What it is is that the Disney tickets have a strip on the back of the tickets for you to sign them, like a credit card almost. And now and then when you go in a disney park they may ask for id to almost prove the ticket is yours.
What we found when we went over though is that when you go to the Disney park you put your tickets through then you put your thumb on the pad for it to take the print, your ticket is then registered to your print so when you enter a park you put your ticket through the machine put your thumb on the pad get your ticket and walk through the turnstyle its that simple. and most times if it doesn't register your print on return vist the cast members let you through anyway!!! we were a family of four and quite often got the tickets messed up.
Its nothing to worry about and when you get to the park you will see what i mean! I hope you have a truely awesome Holiday we are going again in August and we can't wait!!!
If you have anymore questions please ask or have a look at http://www.attraction-tickets-direct.co.uk/forum/ everyone is really friendly there and very helpful