Programmering i Maskinkode på AmigaPublisher: Dataskolen
Notes: This is a mail order course - in Danish. Assembler programming.
The pages were of red paper to prevent photocopying. But with modern day scanners and colour-printers this isn't an issue anymore.
Special thanks to Laust for letting me grab a copy of the disks.
If you're looking for an english version you can look at his site: palbo.dk.
You can also find a Vector course here. The paper on this was "copy protected" using green paper.
You can also find the same course in Danish on Laust' site, he's typed it in to make clean documents.