Anti-DRM Day sale: 50% to 60% off at O’Reilly with coupon

O’Reilly Media (not to be confused with Papa Bear) is celebrating anti-DRM Day by offering 50% to 60% off their ebooks and training videos when you use coupon code DRM2015 over there by May 7 at 8am eastern time. Over 11,000 titles are eligible for 50% off. If your order total is $100 or more, the coupon gets you a 60% off discount instead. They have content on GiMP, Lightroom, Photoshop, DSLR camera guides, digital photography, technique and tutorials, and more.