XimpleWare sued Versata in November 2013, claiming Versata’s software, Distribution Channel Management, contains portions of XimpleWare’s copyrighted and patented source code licensed under the General Public License.

XimpleWare has also made argument that Versata’s customers infringed XimpleWare’s patents by using the software, because GPLv2 does not grant a patent license-only a copyright license.

Links to further information:

Larry Rosen: A Case Study In Understanding (and Enforcing) the GPL

Lawsuit threatens to break new ground on the GPL and software licensing issues, by Aaron Williamson

Versata Can’t Dodge XimpleWare’s Software Copyright Suit By Beth Winegarner

The Versata case: Third party beneficiary possibly able to enforce copyleft obligation in state court

Documents available from RECAP’s docket reports for Versata v. Ameriprise and XimpleWare v. Versata.