Comment 7 for bug 1464086

David -- per http://calibre-ebook.com/bugs :

"If you are including some sensitive data in your bug report like a copyrighted book or a debug log, mark the bug as "private", then the data will not be visible to all. You can do this by finding the location where it says "This bug is public" in the top right area of the bug's page and clicking the yellow icon next to it."

This prevents anyone from seeing the bug report and/or attachments unless they are cleared to view private user information (or are currently subscribed to the bug, like the reporter).

Just for the future. :)