Web links in software

[curry]

Does anyone know whether permission is needed from a web page owner 
to put a URL link to that page in a software application? (Similar to 
the way a link is placed on the internet?)

My application will include some reference info on topics, with links 
to some web sites that are mostly non-profit organizations or 
informative pages about the topics.

This is getting a bit OT I'm sure but I'm going to do the app in Rev 
and wondered if anyone had used links like this before or knew about 
it.

Thanks,

Curry