edit: That said - and even though we're semi off-topic - I contest that the google calculator API has no restrictions with being accessed by scripts or crawlers.
Note that their T&Cs under section 5.3 specify compliance with any 'robots.txt' file on the domains. In http://www.google.com/robots.txt, there is no mention of the /ig/calculator subdomain being prohibited to robots.
Also, under 5.5, the service isn't actually being duplicated, copied or resold.
Any thoughts on that?