This download includes the commercially available release of Kodo version 4.0.0. Kodo is an implementation of the Java Persistence API and Java Data Objects specifications for relational databases. A copy of each specification is provided in the documentation.
You just downloaded one of the following:
kodo-4.0.0.tar.gz - Kodo version 4.0.0 for Unix or Mac OS X.
kodo-4.0.0.zip - Kodo version 4.0.0 for Microsoft Windows NT
and Windows 2000.