jfreechart-1.5.6.jar is the unmodified upstream JFreeChart 1.5.6 core JAR. The patcher stores it inside the Analyzer UI plug-in under the existing embedded entry name lib/jfreechart-1.5.3.jar; the established jfreechart-swt-1.0.17.jar SWT bridge remains in place.
JFreeChart is licensed under the GNU Lesser General Public License, version 2.1 or later (LGPL-2.1-or-later). Source code, license information, and the corresponding release are available from the upstream JFreeChart project and its v1.5.6 release.
The two source files under src/org/jfree/ are original compatibility facades in this patch package. They preserve legacy JFreeChart API entry points used by the existing SWT bridge; they are not copied from JFreeChart.