On the "noise list" at the School of Information at Berkeley, we recently got into a discussion about the copyright status of The Official White House Photostream's Photostream on Flickr.   Some of us would agree with the argument presented on the blog of the Creative Commons (Why Did the White House Choose Attribution and not Public Domain?) that

The photos are likely in the public domain because they are works created by the federal government and not entitled to copyright protection. As you might recall, the Whitehouse.gov’s copyright notice indicates as much.

At present, Flickr doesn't allow an ordinary user to state that one of his pictures is in the public domain.    I've been waiting for CC0 to be added to list of CC licenses you can use.  Of course, the White House isn't necessarily a regular joe user,  and there is already a structure in Flickr already to handle public domain-ish photos:  the Flickr Commons with its "no known copyright restrictions" provision .    Perhaps putting White House photos in Flickr Commons won't quite work either.  Would one be able to put images produced by the US government  into the Flickr Commons in general?

BTW, one of the comments on the Creative Commons post pointed to http://www.flickr.com/people/whitehouse/ in which we find the following stipulations:

These official White House photographs are being made available for publication by news organizations and/or for personal use printing by the subject(s) of the photographs. The photographs may not be used in materials, advertisements, products, or promotions that in any way suggest approval or endorsement of the President, the First Family, or the White House.

Given that these photos are arguably in the public domain (as argued in the creativecommons.org blog post), are these stipulations legally enforceable?

I'm puzzled by how to provide  the correct attribution to derivatives of Creative Commons licensed.  Does one have to track the entire provenace of the object?  I came across this problem when I wanted to upload a photo from the Wikipedia to Freebase.  Here's how I posed my question on the Freebase general support board:

I'd like to upload the latest photo from http://en.wikipedia.org/wiki/File:Garret_Dillahunt.jpg (e.g., http://upload.wikimedia.org/wikipedia/commons/0/0e/Garret_Dillahunt.jpg) to http://www.freebase.com/view/en/garret_dillahunt but am in a quandary about how to do the proper attribution. The photo in question is a derivative (cropping + light adjustment) of http://www.flickr.com/photos/28821738@N05/2843824072/ — which is licensed under a CC-BY-SA license. If I want to use the Wikipedia photo (a deriv of the one in Flickr), who do I credit as the copyright holder? The uploader of the Flickr photo? ( if so, do I enter http://www.flickr.com/people/28821738@N05 or watchwithkristin or Kristin Dos Santos) The Wikipedia? The wikipedia user who made the last derivative?