Via BoingBoing, this bit from vnunet.com:

The UK has warned America that it will cancel its £12bn order for the Joint Strike Fighter if the US does not hand over full access to the computer software code that controls the jets.

Lord Drayson, minister for defence procurement, told the The Daily Telegraph that the planes were useless without control of the software as they could effectively be “switched off” by the Americans without warning.

“We do expect this technology transfer to take place. But if it does not take place we will not be able to purchase these aircraft,” said Lord Drayson.

Access to the source code isn’t going to help you when the US war machines evolve sentience while they’re still halfway across the Atlantic, boyo.