I have received a Infringement notice from WolframAlpha for linking to their website from an android app.

Description of App : App shows the district in which a vehicle was registered using some characters in the number/license plate. When the user click the District name, the app redirects the user to WolframAlpha website (Eg: http://www.wolframalpha.com/input/?i=Hyderabad ). I have unpublished the App for now. but the main doubt I had is isn't it just like linking to a website ?

TOS of WolframAlpha: http://www.wolframalpha.com/termsofuse/general/