I don't know if this is something that everyone else knows about, but I am just learning about Creative Commons licensing. It has been around since 2001, and provides a way for creators of content to set up the way that they want their work to be used by others. What do we know about them and what if any, are problems associated with using cc licensed work? They provide a searchable database for cc licensed work as well as links which allow you to cc license your own work. It certainly seems in line with open source products and free software, the "let's share" movements. I like what I see.....


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Google Advanced Search
Within Google advanced search, you can select the copyright/licensing level as a parameter of your search. At the bottom of the search box, there is a link that says, "Date, usage rights, numeric range, and more". Within that, you can select whether the searched content is free to use, share, modify or use commercially. I have not been successful in using it to find images that have licensing information, but there are many text examples. As best I can tell, in order to show up in a filtered list for licensing, the site must have their creative commons licensing embedded in the page.
There are many artists and musicians using Creative Commons as a way to share and build projects. I've found several pieces of old historical poetry or narrative that are listed as Creative Commons licensing. I'm not quite sure how that works; the Perseus Digital Library at Tufts, for example, has narratives for a huge number of Greek classics, English Rennaissance texts (i.e. Shakespeare), and personal diaries/narratives from pre-1900. Clearly writings that old are outside of copyright protections, but I guess they must have gotten permission from the owners of the documents, the translators, or the editors who compiled the documents.
Anyway, a discussion of Creative Commons definitely needs to be part of any information literacy conversation. I think that the concept of Creative Commons is something many kids intuitively understand - there are numerous examples that are part of pop culture (think Soulja Boy - if you aren't familiar with that, do a search on YouTube and see what comes up!)
Google Images Advanced Search
Yes, it would be nice to have the usage rights filter included on the Google Images search page.