Comment 2 for bug 1700611

Making the file 0600 makes apt-cache complain about it when run by non-root users. Is that an issue worth having?

<ack> $ apt policy asdf
<ack> E: Opening /etc/apt/sources.list.d/dropbox.list - ifstream::ifstream (13: Permission denied)
<ack> E: The list of sources could not be read.

(dropbox.list was just an example)