I'm not a fan of Bing; I cringe at their campaigns. Giving them a big point here is a difficult thing to do, but as long as they are successfully executing on this feature, they certainly deserve it. While Google allows you to filter image results by size, color, type, time, etc, they don't appear to have any way to filter images based on your permission to use them. Bing just announced a feature that allows you to [search by image rights]–sorting by All; Public Domain; Free to share and use; Free to share and use commercially; Free to modify, share, and use; Free to modify, share, and use commercially. Another interesting feature is that you can do the search directly from Office 2013, where it will only show licensed images by default.
A lot of people don't pay much attention to image licensing and just grab any image they find to accompany their post, presentation, etc, but the reality is that many of those images do not have a Creative Commons license, and should not be used without permission. Whether you're using someone's images, or are an artist/photographer creating your own images, I would definitely suggest some light reading on Creative Commons licensing at creativecommons.org
Searching Images by Usage Rights – Search Blog
The Bing Image search team has been hard at work. Today, we are excited to offer the “Search by License” feature for Bing image search. At