[Sigia-l] (off topic) book question

[PeterV]

Here's a question: when I use a website to illustrate something in a book, 
do I need to ask their permission? Should I? And who should I ask? What if 
they don't respond? My publisher tells me I need a signed paper for each 
website, does that sound ok? (It just sounds a bit strange to me) Or are 
they just covering themselves legally? I'm just not sure what normal 
accepted practice is in this case...

Yahoo has a media relations department:
http://docs.yahoo.com/info/copyright/permission.html
You must ask them permission and include complete samples of each proposed 
use. So that means I have to do all my case studies before, and then ask 
permission. And what about sites that don't have a department like that? 
Any real life tips?
PeterV
http://petervandijck.net