update

Author: Andreas Kugel

doc/opencodes.md

@@ -67,7 +67,7 @@ Daniel Heiss' [Cryptolab](https://zkm.de/de/kryptolab) has math as its primary t
 ## Code examples
 All code samples are in the [source](../src) folder. Files ending with .py are pure Python3 files. Open them with an editor or an IDE like idle3. There are also 3 notebooks, ending with .ipynb, which are Python3 in a more convenient format for learning. The tool [jupiter-notebook](https://jupyter.org/) is required to open them.
 
-Credits go to a larger number of people who shared their ideas on publicly availably platforms (like this one) so I could go ahead and include  or adapt code fragments together with my own ideas. Credits also go to Ernst Jandl for the poem [Ottos Mops](../data/otto.txt) and to [Larva Labs](https://www.larvalabs.com/cryptopunks) for the [punk image](../data/punk.png). The files are copied from the depth of the internet. While giving nice results in the examples, they are neither very special, unique nor important and you can replace them with any other text or image you may find or create. 
+Credits go to a larger number of people who shared their ideas on publicly availably platforms (like this one) so I could go ahead and include or adapt code fragments together with my own ideas. Credits also go to Ernst Jandl (rights probably owned by [Luchterhand](https://www.randomhouse.de)) for the poem [Ottos Mops](../data/otto.txt) and to [Larva Labs](https://www.larvalabs.com/cryptopunks) for the [punk image](../data/punk.png). The files are copied from the depth of the internet. While giving nice results in the examples, they are neither very special, unique nor important and you can replace them with any other text or image you may find or create. Finally thanks to the person who posted the nice picture of his or her [mops dog](../data/ottos-mops.png) somewhere (I forgot where I got it from). Again, feel free to replace it with you favorite pet (make sure to get the poem right too).
 
 We start with a more general [excursion on data](../src/1-basicData.py) and their possible "interpretation". Next, we go into the very basics of [programming](../src/2-basicPython.py), using Python. Topics are variables, data types, functions and loops.