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License to use: Creative Commons                                                                                         < Previous page       Next page >

The statement on this page can be downloaded as a pdf file.


Information and Cooperation

If you share, apply, quote or distribute the work, the developer will be grateful if you send him a message to inform him.

If you think that the computer program and its results are material for scientific or other publications or presentations, please contact the Author with your ideas or proposals.


Computer programs: Installation

Roorda’s computer programs run in Microsoft Windows. They don’t need installation, as they are all portable. Just place the program file in a suitable location and run it.


Copyright: Creative Commons License

Roorda's textbook accessories, computer programs, presentations, and the Pledge; as well as any texts, images, videos or anything else extracted from or produced with them, either separately or combined, are here referred to as “the work”. Roorda is here referred to as the "Author".

The work can be distributed under the conditions of the Creative Commons Attribution-NonCommercial-NoDerivs (CC BY-NC-ND) 3.0 license.

An explanation of this license is available at

The license implies that you are free:

  • to Share — to copy, distribute and transmit the work

Under the following conditions:

  • Attribution - You must attribute the work in the manner specified by the author (but not in any way that suggests that he endorses you or your use of the work).
  • Noncommercial - You may not use this work for commercial purposes, unless you have acquired explicit and written permission to do so from the Author.
  • Share Alike - If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.

With the understanding that:

  • Waiver - Any of the above conditions can be waived if you get permission from the copyright holder.
  • Public Domain — Where the work or any of its elements is in the public domain under applicable law, that status is in no way affected by the license.
  • Other Rights — In no way are any of the following rights affected by the license:
    • Your fair dealing or fair use rights, or other applicable copyright exceptions and limitations;
    • The author's moral rights;
    • Rights other persons may have either in the work itself or in how the work is used, such as publicity or privacy rights.
  • Notice — For any reuse or distribution, you must make clear to others the license terms of this work. The best way to do this is with a link to the web page

You are not free:

  • To make commercial use of the work. If you want to do so, you need explicit and written permission from the Author.
  • To Remix — to adapt the work.

Attributions to the work are to be made as follows:

         [Name of the accessory / computer program / presentation]
         © Niko Roorda

Niko Roorda, PhD

Sprang-Capelle, The Netherlands

November 2020

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