Hi Hans,
All shared folder members can actually see who's part of the shared folder by clicking on "Options" next to the shared folder under https://dropbox.com/share
It is not possible to limit this view. If you'd like to avoid this, you could use shared links but please keep in mind that people with the link will have read-only access.
By the way: Sie können hier auch gerne auf Deutsch posten, da es das deutsche Forum ist 🙂
