Approximate Minimum Total CC Licensed Works as of December 2010: 400+ million
The Metrics Portal is about gathering, processing and visualizing metrics about Creative Commons' related projects, with particular emphasis on the adoption and usage of Creative Commons licenses internationally. Join us!
The best place to communicate on this is through the cc-community mailing list for general discussion, cc-devel for technical discussion, and the #cc chat channel on irc.freenode.net. If really deep into this, please consider joining into the commons-research community. Join in the fun!
A draft of the 2012-13 CC research agenda that in part relates to metrics can be viewed here. Input and suggestions welcome!
This is the home of the CC-Monitor online platform, which contains automatically collected data, graphs, research and collectively written commentary on the global adoption of Creative Commons licenses. It is our hope that this will become a valuable online resource for the Creative Commons community, for researchers, the press, and other third parties. We will invite many more experts on CC and all things 'open' to contribute to this resource in due time. Click on any of the links below to access statistical information, original research and commentary on the adoption of Creative Commons around the world.
Giorgos Cheliotis and the researchers at the Participatory Media Lab based at Singapore Management Univerity have been tracking and analyzing the development of Creative Commons worldwide. His 2007 TRPC paper "Taking Stock of the Creative Commons Experiment," is available here. The Lab's research wiki is a great resource for some of the latest research on CC adoption. Further slides:
Mike Linksvayer, VP of Creative Commons, has also given a few presentations in the past on the analysis and development of metrics for measuring the progress of CC licensing:
The First Interdisciplinary Research Workshop on Free Culture held in August, 2008 featured several metrics-related presentations.
Others on Flickr data.
License statistics has basic information about linkback/page/search-engine-query-based license adoption statistics, as well as the code used to gather this data and dumps of the data itself.
Content Directories lists licensed works counts for many sites that collect CC-licensed works, e.g., about 100 million at Flickr.
Counts for selected top sites over time may be found on the license statistics page.
Eventually code above should be expanded to collect this and finer-grained information (e.g., per site license breakdown) from these sites. See Site CC Portal and Metrics for information on how your site can help.
Creative Commons Data
The Approximate Minimum Total CC Licensed Works is based on licenses reported by Yahoo search queries and Flickr and is the minimum number of licensed works across all licenses (Flickr numbers are used for the 6 main 2.0 licenses -- which are all that Flickr supports -- since we know at least those exist). See the estimation code, estimates, and data.