I`d like to try this out, but the page won`t let you cut`n`paste so you can use a translator. And I can`t read German.
Embedded JavaScript was use to override the right mouse button function.
IF you are using Internet Explorer; to defeat it, use Front Page Express/2000/XP to load the page then copy the required text. I find it an annoyance when a website controls my PC.
Here is a similar code to the website's embedded JavaScript's right button blocking.
I think there are utilities to disable this javascript function.
I use "Mozilla 1.2.1" against this type of websites.