The Open Database License (ODbL) is an open license for data and databases which includes explicit attribution and share-alike requirements.
This license, the first of its kind, is a major step forward for open data. There are currently very few licenses available suited to data and databases and none which provide for share-alike (existing share-alike licenses such as the GPL, GFDL and CC By-SA are all unsuitable for data).
The development of the ODbL, has been a major effort extending over more than one and half years with an intensive consultation and review period for the last 6 months. We’d like to express our thanks to the communities and individuals who have contributed during this time.
The open access movement:
Putting peer-reviewed scientific and scholarly literature
on the internet. Making it available free of charge and
free of most copyright and licensing restrictions.
Removing the barriers to serious research.
I recommend the OA tracking project (OATP) as the best way to stay on top of new OA developments. You can read the OATP feed on a blog-like web page or subscribe to it by RSS, email, or Twitter. You can also help build the feed by tagging new developments you encounter.