From the website;
The Humble Dynamite 10th Anniversary Bundle
Celebrating 10 years of Dynamite Entertainment with an explosive amount of content. The Humble Dynamite 10th Anniversary Bundle features 118 issues across 17 comic book titles. Name your price for Project Superpowers Vol. 1, Vampirella Masters Vol. 1 & 2, Sherlock Holmes Vol. 1: The Trial of Sherlock Holmes, Chaos! #1, Vampirella vs. Fluffy, My Little Phony: A Brony Adventure and Cryptozoic Man #1-4, plus the entire collections of Amanda Hocking's The Hollowland and The Mocking Dead. If you pay more than the average price you'll also get Jim Butcher's Dresden Files: War Cry #1, Legenderry: A Steampunk Adventure #1-3, Pathfinder: Dark Waters Rising Vol. 1, Red Sonja: Queen of Plagues Vol. 1, Vampirella Masters Vol. 4 and Kevin Smith's The Green Hornet Vol. 1 & 2, along with the complete George R. R. Martin's Wild Cards.
Pay $15 or more to get all of the above plus all 36 issues of Robert Jordan's Wheel of Time Vol. 1 and The Dynamite Art of Alex Ross.
Pay what you want. Purchased separately, this instant comic collection would cost you up to $258, but we are letting you set the price!
Compatible with computers and mobile devices. These comics are available in multiple formats including CBZ, PDF, Mobi and ePub, so they work on your computer, eBook readers and a wide array of mobile devices. Instructions and a list of recommended reading programs can be found here.
Support charities and comic creators. You choose where your money goes: between the comic creators and charity. This bundle supports Make-A-Wish, the Comic Book Legal Defense Fund and Doctors Without Borders. If you like this promotion, a tip to Humble Bundle would be greatly appreciated
there is also a new free issue each day for the duration of the sale
Isn't CBZ a "pirate" format, the comic equivalent of 'Mp3'? And we all know that people who download Mp3s are EEEVIIILL, just ask the Liberal Party.
Seriously though, CBR is just a zip file containing Separate Image files and a renamed extension, but it is very DRM-free. There is also Cbr, a renamed Rar archive. There isn't much point to archiving Jpegs other than easier distribution, since they normally only compress by up to 3% unless you use special programs like Stuffit Sitx or PreComp (they get 10-25% compression rates on Jpegs). Apparently the Jpeg format developers omitted one compression step, and these programs can add it back in, but you have to unpack to be able to view the jpeg images.