Back in July, ComiXology addressed one of the biggest questions people had with its digital comics service: Do customers actually own the issues they buy?

The company unviled a DRM-free backup feature, but only for a handful of publishers, including Image Comics, Dynamite Entertainment, and Top Shelf Productions, among others. This week, ComiXology announced a second wave of publishers that will offer DRM-free downloads -- and no, Marvel and DC still aren't part of the deal.

The second batch of publishers to offer downloadable backups of comic purchases includes IDW Publishing, Valiant Entertainment, Oni Press, Fantagraphics Books, Aspen Comics, Action Lab Entertainment, Th3rd World Studios, A Wave Blue World, Blind Ferret Entertainment, Caliber Comics, Creative Impulse Entertainment, Devil’s Due Entertainment, GT Labs Comics and Kingstone Media. They join Zenescope Entertainment, Monkeybrain Comics, Thrillbentand the aforementioned Image, Dynamite, and Top Shelf.

That's a major expansion, though one has to wonder just what percentage of ComiXology's sales this group represents. Certainly Marvel and DC remain a big slice of the pie, and without their participation, many purchased comics still live solely on a server somewhere.

To get a DRM-free backup of your ComiXology purchases, go to the "my books" section oft the ComiXology app or website and click the download button. Backups are available as PDF and CBZ files.