Thank you all for your hints and tips.

I solved the problem with creating PDF files. There you can define that the document just can be printed once.

By the way - PDF gives the publisher the possibility to configure the document in many ways. You can set security options like access password for opening the document, grindability and print options (e.g. the document can just be printed once or x times, writable access, etc.)

good luck
cmuebro