This software is licensed under the NXLOG PUBLIC LICENSE v1.0. Please find the details of licensing here: https://nxlog.co/nxlog-public-license

As of today (9/16/2017) license is as follows:

NXLOG PUBLIC LICENSE v1.0

1. DEFINITIONS

“License” shall mean version 1.0 of the NXLOG PUBLIC LICENSE, i.e. the
terms and conditions set forth in this document;
“Software” shall mean the source code and object code form, all associated
media, printed materials, and 'online' or electronic documentation. All
such software and materials are referred to herein as the 'Software' and
are copyrighted by Licensor;
“Licensor” refers to the copyright holder of the Software, i.e. NXLog Ltd.

2. GRANT OF LICENSE

Licensor hereby grants you the following rights, provided that you comply
with all of the restrictions set forth in this License and provided,
further, that you distribute an unmodified copy of this License with the
Software:
i. You may copy and distribute verbatim (i.e. unmodified) copies of the
Software as you receive it, in any medium;
ii. You may modify the Software, create works based on the Software and
distribute copies of such, in any medium.

By downloading, using, modifying and copying the Software (or any work
based on the Software), you indicate your acceptance of this license to
do so, and all its terms and conditions for using, copying, distributing
and modifying the Software or works based on it. Nothing other than this
license grants you permission to modify, distribute the program or its
derivative works. If you do not accept these terms and conditions, do not
use, modify or distribute the Software.

3. RESTRICTIONS ON COPYING, DISTRIBUTION AND USE

The Software may be copied and distributed with or without modifications
in source code and object code form and may be used for commercial and
non-commercial purposes provided that the following restrictions are met:
i. Distribution of the Software is prohibited if any payment is made in
connection with such distribution. You may only charge a reasonable fee
to cover the costs of copying and redistribution;
ii. Bundling the Software with a commercial product or using it to
provide commercial services is prohibited if your product or service
explicitly depends on the Software to be able to operate or function.
You may use the Software without modifications to provide commercial
services or to bundle it with your product provided that your service or
product can also operate or function without the Software.
A commercial license is available if you wish to incorporate the Software
into your product or service which explicitly depends on the Software to
be able to operate or function.

4. RESTRICTIONS ON MODIFICATION AND DERIVATIVE WORKS

The Software may be modified and derivative works may be distributed only
under the terms of this license with the following restrictions:
i. Any modifications and enhancements to the Software, including any newly
developed scripts, libraries, modules that depend on the Software, are
considered derivative works (“Derivative Work”).
ii. If you have modified the Software or created Derivative Work, you
must cause the work to carry prominent notices stating that you have
modified the Software's files and the date of any change. In each source
file that you have modified, you must include a prominent notice that you
have modified the file, including your name, your e-mail address (if
any), and the date and purpose of the change;
iii. All Derivative Works must be made public in source code form by
making it accessible for download over the internet. You must also notify
Licensor about the Derivative Work in e-mail;
iv. All Derivative works must be distributed with an unmodified copy of
this License;
v. By creating a Derivative Work, you assign all copyrights relating to
the modifications to Licensor. You acknowledge that Licensor will own all
copyrights and Licensor may use and distribute the Derivative Work to
third parties under different terms from that of this License.

5. NO WARRANTIES

The Software is provided “AS IS” and Licensor makes no warranty as to its
use, performance, or otherwise. To the maximum extent permitted by
applicable law, Licensor disclaims all other representations, warranties,
and conditions, express, implied, statutory, or otherwise, including, but
not limited to, implied warranties or conditions of merchantability,
satisfactory quality, fitness for a particular purpose, title, and
non-infringement. The entire risk arising out of use or performance of
the Software remains with you.

6. LIMITATION OF LIABILITY

This limitation of liability is to the maximum extent permitted by
applicable law. In no event shall Licensor be liable for any costs of
substitute products or services, or for any special, incidental,
indirect, or consequential damages whatsoever (including, without
limitation, damages for loss of business profits, business interruption,
or loss of business information) arising out of the use or inability to
use the Software, even if Licensor has been advised of the possibility of
such damages. In any case, Licensor's entire liability arising out of
this Agreement shall be limited to the greater of the amount actually
paid for the Software; provided, however, that if you have entered into a
Technical Services Support Agreement, Licensor's entire liability
regarding support services shall be governed by the terms of that
agreement.