Today (6th May) is International Day Against DRM, the dishonest restriction mechanism that affects most electronic purchases.
The book publisher O'Reilly Media which specialises in training and reference books such as programming is celebrating it with a 50% off its books and saying something I would never expect from an eBook publisher:
Notice what they say where I put in the red arrow...
I somehow can't imagine Amazon or most other eBook sellers saying this. :disagree: