How to legally obtain news feeds for a News App?

Hi Friends,

Not sure if this is right place to ask this BUT let it be.....

I want to create an app which will be able to provide specialized news to users. Help me find answer of this..

How can I obtain News from traditional media houses like BBC, CNN legally & be able to distribute?

I am not interested in modifying news or altering content or i have no problem giving credit to source. However if possible I would like to sell ads on footer or header of APP(not inside news).

--Thanks & Regards