Third-Party Copyright Notices

Duxbury Use of Third-Party Proprietary Software

Duxbury Systems makes some use of third-party software that is not Open Source (a term explained in the next section). This category of proprietary software is included with permission of the copyright owner, and we acknowledge that copyright.

In the Windows version, certain Duxbury applications, including DBT, PerkyDuck, and BERT, use a third-party dynamic library to maintain communications with the eBrailler Cosmo device.

Duxbury Use of Open Source Software

Open Source software often provides useful tools and functions that advance the state of the art for all software developers as well as software users. Generally speaking, Open Source software is available on the Internet in source code form, where any developer or user can obtain it and compile it into new works subject to the restrictions of the original authors and contributors. Several Duxbury products include Open Source software from a third party.

The compiled, binary form of such software is often referred to as a library, package, or component. In many cases, the compiled forms of Open Source software are likewise available for copying and re-use, and once again this use is subject to the restrictions imposed by the original authors and contributors. To redistribute any such component, one must include the copyright statement and terms of use that accompany that component.

Most Duxbury products on the Windows and MacOS platforms use the wxWidgets Cross-Platform GUI Libraries to implement the user interface and provide a number of low-level functions. The wxWidgets libraries have a number of authors and contributors.

All other third-party open source software used in Duxbury products is listed below and in the related subtopics. Note that components shipped with a Duxbury product and not listed below should be understood to be subject to the copying restrictions outlined in the Duxbury End-User License Agreement (EULA).

The lists below do not include information about Open Source software that may be included in the operating system software on which the Duxbury applications run. The manufacturer of the operating system should post information about its use of Open Source software.

Open Source Components by Duxbury Product

Apart from wxWidgets, Open Source software components included with each Duxbury product appear in the lists below.

DBT (Duxbury Braille Translator)

DBT includes these Open Source components on the Windows platform. They are used to support importing various document file formats.

DBT for the macOS uses three dynamic libraries to maintain communications with eBrailler Cosmo devices.


NimPro includes two data files that are used to interpret the symbols that may appear in DAISY/NIMAS input documents that include MathML.

Perky Duck

PerkyDuck on macOS uses three dynamic libraries to maintain communications with eBrailler Cosmo devices.

BERT (Braille Education Remote Training)

BERT on macOS uses three dynamic libraries to maintain communications with eBrailler Cosmo devices.


QuickTac for macOS includes additional copyrighted Open Source software to implement curve drawing.