Hello guys, here on Brazil we have an "brazilian Ebay" called mercadolivreNow i want to buy for Office 2013 too (R$50,00 --> $20.00 USD) 1 seller(from many others), already sold 1200 times on last 12 months, 1200 positive feedbacks I can see many announces selling Windows 7, 8.1, Office 2010 2013 etc.. with really nice prices, and all with good feedbacks saying it works As i saw they sell Windows 8.1 cdkeys called FPPs (Full Packaged Product, what is that?) And they say it is a lifetime cdkey, is it true? The only thing they say is: i cannot install on another PC simultaneous, and if i do, the cd key will be blocked Backing to Office 2013 cdkeys, it isn't FPPs but VL(in some cases) , but they say the cdkey will work 4ever The only advise is i cant install in other PC, but i can install again if i need to format my PC Here is my question. If i must format, How do microsoft knows ill install on same PC and not on other PC? What if my HD dies, and i need install a new Windows on other HD, they will think im installing on a new pc and im f********d? How it exactly works? Im almost buying And why it is so cheap? The only thing i can imagine is: they buy many cd keys on Microsoft for a good price, and then sell it. Is there any Trick? For example, on next year the Seller just ask for microsoft a new cdkey saying someone stolen his cdkey, and then microsoft blocks my cdkey, does it even exist or am i being paranoid? Thank you!