Starting with version 3.2, the AxoSyslog application is licensed under a combined LGPL+GPL license. The core of AxoSyslog is licensed under the GNU Lesser General Public License Version 2.1 license, while the rest of the codebase is licensed under the GNU General Public License Version 2 license.
Note
Practically, the code stored under thelib directory of the source code package is under LGPL, the rest is GPL.
For details about the LGPL and GPL licenses, see GNU Lesser General Public License and GNU General Public License, respectively.
The Documentation is licensed separately. For details, see The syslog-ng OSE Documentation License.