Hello,

I am currently writing an Android Newsreader app. As the Calibre recipe collection is very large, I was thinking about using it for my news reader.

I noticed the recipes are licensed under the GPL, v3, which states the source code for a modified bit of code must be made public.
This is why I was wondering whether this meant that (if I used the recipes) I would have to make my whole source code public, or just the recipes?

Thanks,

InvisibleMan

Any code that uses GPLed code has to be open sourced under a GPL compatible license.

http://www.gnu.org/licenses/gpl-faq.html