It looks like the font(s) is "Shift Light":
Code:
@font-face {
font-family: "Shift Light";
font-style: normal;
font-weight: normal;
src: url(../fonts/00068.otf);
}
@font-face {
font-family: "Shift Light";
font-style: italic;
font-weight: bold;
src: url(../fonts/00069.otf);
}
I don't actually need the fonts. In the past, I'd automatically delete all the font stuff when I messed with the book. I only recently started keeping it (I figured there was no down-side to keeping it (except maybe some extra size)). But, since this might be a new issue with Calibre, I thought I'd report it.
Also, I found another book with fonts (and they're red-shielded as well): Jim Butcher's "Peace Talks." It has the same problem all around. Oddly, it too uses those two Shift Light fonts. So, I'd guess it's an actual Calibre issue.