We have a number of PDFs that we've protected with Content Server.
Per our spec here, each PDF has a first page that is the book's cover, and, in Acrobat Pro, we've set the page label for that first page to "Cover", using Advanced/Number Pages... and choosing Style: None, Prefix: Cover, Start: 1.
Opening the resulting protected file in Digital Editions, we see "Cover?" in the page label box on the first pages. ADE gets the rest of the page labels right - it goes to "i" for the second page, and so on.
Why does Digital Editions add a ? to the label for the first page? How can we avoid this?