Rufus Pollock and Paul Stepan have self-archived "The Size of the EU Public Domain."
Here's an excerpt:
This paper reports results from a large recent study of the public domain in the European Union. Based on a combination of catalogue and survey data our figures for the number of items (and works) in the public domain extend across a variety of media and provide one of the first quantitative estimates of the 'size' of the public domain in any jurisdiction.
See also their related eprint "The Value of the EU Public Domain."
