EPESI is Free and Open Source Software: FOSS 
It is released under the MIT License MIT License
This application is developed and is copyrighted by Telaxus LLC.
Copyright © 2006-2015 Telaxus LLC
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/orsell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHERDEALINGS IN THE SOFTWARE.
Please note that some software included in epesi framework may be distributed under different licensing terms. Please check individual directories and files for separate licenses. Directories that should be examined carefully are libs and modules/libs - they contain third party software utilized by epesi framework and distributed as open-source but under different licensing terms (like GPL, LGPL, freeware and MIT).
If you are a developer and are wondering what it means in plain english then the following may be of interest to you:
We carefully analyzed available open-source licenses and decided to use MIT because it is:
- compatible with licenses of packages/libraries included with epesi
- GPL compatible
- OSI approved
We choose MIT (also known as X11) license instead of GPL because we need GPL compatibility and at the same time we don't want to force you to share the code if you don't want to (GPL is a strong copyleft license). You are free to use epesi framework according to the above license terms but you can create your own solutions/modules and offer it as open source, freeware or commercial software. We develop custom modules for our customers as well and they are offered under special commercial licensing terms.