I wonder if any of the posters who are suggesting that Lowe could do work for Mercedes criticised IP being passed from Ferrari to McLaren or from Mclaren to Renault.
When I left school I got an apprenticeship as an engineer and it was written into the contract that anything I came up with be it an invention or just something that improved efficiency of the plant and no matter if I thought of it or developed it in my own time or the companies time it belonged entirely to the company I worked for, and so it would be safe to say that whilst Lowe is on McLaren's payroll then anything he works on and develops belongs to McLaren and if he gives it to Mercedes then he can and will be prosecuted for industrial espionage....
The company that employed me was called Tenneco and is now known as Tenneco Inc, you probably have never heard of it but it isn't a small company it is massive, here's a link showing their status.
http://en.wikipedia.org/wiki/Tenneco
Nothing to do with F1 maybe but everything to do with companies and the way they operate to protect themselves and their developments and so why should McLaren be any different ...?
Basically anything and everything Lowe works on this year belongs to McLaren....
When Newey returned from gardening leave from Williams and began working for Mclaren, Mclaren appeared with an identical wing to the Williams. Lowe may be still working on Mclarens current car, but they can't stop him thinking about Mercedes 2014 car, suggesting they can, is just wishful thinking.