Here's my source:

http://shop.oreilly.com/category/ebooks.do

"They're Your Books

Unlike most other retailers, ebooks from shop.oreilly.com are not restricted. You can freely loan, re-sell or donate them, read them without being tracked, or move them to a new device without re-purchasing all of them."

So does that mean that I can share my e-books on my website for free? or will I be breaking the law?

I know that I should ask a lawyer, but I don't know any lawyer specialized in intellectual property and Digital Rights Management.

I also sent an e-mail to O'Reilly, no response.