Hi Benjamin and welcome abord,
Well, I've never used it but in brosing in internet I found this:
Q: Does the Pen Drive have a write protection feature?
A: Yes, the Pen Drive has a write protection switch on the side of the Pen Drive. When the switch is opened, the data can be read and written from/to the Pen Drive, when it is closed, the data can only be read but cannot be written to the Pen Drive.
http://www.pendrive.com/faq.php
hope it'll be helpful, but I'll continue searching till one of the techies show.