Pffff. Downloading an ebook cannot be forbidden. Some politician in the Netherlands tried to pass a law that downloading material for which the consumer has no right should become illegal. His vision: "The person must first research if a file is legal for him to download. If he downloads material he has no right to, he could be sued."
Put this into google:
<book title> <author> <epub>
Maybe... just maybe, I'm trying to find a place where I can buy this book? Yes, I often use Google for such things. I often find stores (for computer stuff) that are not on the big price comparison websites. Often Google can search inside sites better than the sites themselves, and so it often returns results that one normally would not obtain.
However, Google's search capability is so vast, that it sometimes *directly* links to illegal stuff on some download site. I've had this happen with books (trying to find an out of print book), with complete music albums (out of "print" CD's), and software (old games).
To prevent an accidental "illegal" download, I would need to research each and every link before clicking it, and that is just completely impossible. Everybody who is on the internet would become a potential criminal with each click, except when doing extensive research first, making the internet unusable.
It was quickly pointed out to him that such a law would be very impractical, and impossible to enforce.