Spreading DRM free E-books in corporate environments

How am I allowed to spread eBooks? To my collegue? My unit? The legal entity where I work? The entire company group?

I couldn't find the answer to this fundamental question on O'Reilly's website. Already purchased a few eBooks as I realised it would be easier to spread the knowledge within our unit if the books we purchase are on a shared space in digital format instead of the usual "pass-around". Then I realised there might (should) be some restrictions for how much I spread the eBooks I purchase.
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