I received this message at Flickr today:
I am busy writing an ebook and would really like to use one of your photos of your Tulsi solar-electric hybrid oven? I would obviously attribute the photo to you and show a link to your page as well-would that be OK with you?
[name withheld by me]
Would you let me know which picture(s) you would like to use? That way, I'll simply change its settings for a Creative Commons license. That will probably make things much easier over the long term, and from what I remember, that includes the documentation you're suggesting, but avoids any potential conflict later.
I appreciate your interest. I was thinking of opening up some of my photos to outside use. Let me know what works for you.
I guess I'll see how things go!