It looks like the BBC is wanting to encrypt the EPG data on the UK version of Freeview HD. They're worried that people will be able to do usefull things with their HD content, like record it. Gasp!
http://news.bbc.co.uk/2/hi/technology/8259154.stm
http://community.zdnet.co.uk/blog/0,1000000567,10013808o-2000331777b,00.htm
I hope FreeviewNZ don't get any ideas...