In short: PLEASE DO NOT DO IT! The e-book, even if it's what you want, most likely it'll come with some hidden files like popups, access to other files whether using a PC or hand-held device, and these can disable your firewall/security features, and access address book/contacts and any number of files. If you copy the file address of the ebook, you can search to see the source, and then search that source to find what others say about it, so that way IF you REALLY want the ebook you can still download it, but I'd still download it from another source just to be safe. Remember, these 3rd party offers are trying to get you to download something that's more for THEIR benefit than yours...THEY have something to gain, and they REALLY want to entice you somehow to download the file. This applies to ALL/EVERY 3rd party downloads. Look before accepting, uncheck the pre-checked items asking you to choose extras. These 3rd party extras are sneaky, and these are usually provided by contracts between companies without really having the end user in mind. Be careful and use common sense.
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