The Open Knowledge Foundation has released the Open Database Licence (ODbL) a sharealike copyright licence written specifically for databases. This will be extremely useful for groups working on open data, including in the context of making government information more accessible
We are delighted to announce the release of v1.0 of the Open Database License (ODbL):
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).