Can I use other sites favicons without asking for their permission?

I am collecting RSS headlines and instead of site name I would like to use its 开发者_JS百科favicon. Is that allowed by law or do I have to ask for permission from every site (in which case, it just doesn't scale)?

The example: http://i53.tinypic.com/30ws7qv.png

Implementation:

<a href="http://nytimes.com/article" class="nytimes-favicon">Headline</a>

I understand that it's not a programming question. I just couldn't find an answer anywhere.

Yes you can use it with asking them. Also they can sue without asking you.

The topic was well discussed here : http://www.webmasterworld.com/forum44/768.htm

Especially, i would notice this point :

Most webmasters will disapprove. Not only are you using their image without their consent, but you're using their bandwidth as well.

I'm sure it is fine as you can add any website's RSS feed to almost any RSS reader and it will display its favicon. Just don't pass it as your own and you are golden.