In a semistrong-form efficient market, publicly available information of any and all kinds is of no use in beating the market.
The implications of semistrong-form efficiency are, at a minimum, semistaggering. What it literally means is that nothing in the library, for example, is of any value in earning a positive excess return. How about a firm’s financial statements? Useless. Information in the financial press? Worthless. A book? Sad to say, if the market is semistrong-form efficient, there is nothing in a book that will be of any use in beating the market. You can probably imagine that this form of market efficiency is hotly disputed.