The GNU General Public License (version 2) is one of the most widely used open source licenses in the world. The GNU GPLv2 is commonly used in Linux distributions and open source applications. Yet, despite being widely used for decades, the GPLv2 has not been tested much in the legal system. Most GPL violations do not result in a trial and so the power of the license has remained largely untested. That is about to change. As OpenSource.com posted,
This lack of court decisions is about to change due to the five interrelated cases arising from a dispute between Versata Software, Inc. (“Versata”) (its parent company, Trilogy Development Corporation, is also involved, but Versata is taking the lead) and Ameriprise Financial, Inc. (“Ameriprise”)
It is expected the court cases will help define what qualifies as a derivative work and how the GPL affects software patents along with other details of how the license is interpreted.