License
Esper and NEsper are open-source software available under the GNU General Public License (GPLv2).
Esper and NEsper including documentation are copyrighted. The copyright is owned by EsperTech Inc.. Unauthorized reproduction or distribution of this copyrighted work is illegal.
For commercial licensing terms, please contact us for any inquiry.
EsperTech provides EsperHA for high-availability, and Esper Enterprise Edition for horizontal scale-out. EsperHA and Enterprise Edition are closed-source. EsperTech makes their source code available on request for commercial support customers.
Trademark
EsperTech Inc. owns the Esper trademark.
Use of the Esper trademark or logo for commercial purposes without the prior written consent of EsperTech Inc. may constitute trademark infringement and unfair competition in violation of federal and state laws.