Open Database License (Draft):

This is a beta release, or a draft version of the licence, for comment and criticism by communities interested in licensing databases using copyleft, open content, and related licensing schemes. Distribution of this draft licence does not create an attorney-client relationship. This information is provided ‘as is‘, and this site makes no warranties on the information provided. Any damages resulting from its use are disclaimed.

From opencontentlawyer.com (thanks to James Duncan).