Hi Markus, sorry for taking part of the discussion. If you think the FTP master position is contraddittory I suggest you to open a thread in debian-devel with ftpmasters cc'ed.
Anyway in my opinion duplicating the lines is better also because copyright file is shown in packages.qa.debian.org/package-name so can be seen for non-linux user, and I don't know if other linux distros have the same symlinks for copyrights. (comes in my mind a use-case when upstream wants to look to the debian specific copyright file, to see if a debian patch can be accepted upstream, e.g. when the debian packaging has a different copyright than the upstream sources). IANAL, but I honestly think a little duplication can prevent headaches and lots of google searches in such cases. Have a nice day, Gianfranco (who is not a DD and only recently started to seriously care about copyrights issues) Sent from Yahoo Mail on Android, please escuse brevity, typos and top-posting.