I can't transfer a rental from my iPod Touch

[WatchTower]

I recently downloaded a rental for free thanks to Orange's "Film To Go" onto my iPod Touch 4g and thought I'll transfer it to my Mac as my Macbook pro is connected to the TV. The problem is when ever I select transfer purchases from my iPod the rental doesn't go to my Mac.

Is there anyway I can transfer it as I'd prefer to see the movie on a big screen with 5.1 surround.

Thanks guys and gals

 

[WatchTower]

Ahh I found where my rentals are on my iPod through iTunes but I can't see any option anywhere the move button is.I read in the FAQ in the iTunes help section that rentals can moved.