tcm
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There is no reason somebody shouldn't write a book provided there are notes at the bottom of each page giving the number of the quote in the Appendix of all the contributors quoted. As seen in many other books.
Er, no, completely wrong
You would need clearance from IPC Media for copyright purposes first if using a direct lifted quote from these threads.
Note that as per t's and c's anything written here is automatically copyright IPC, so it is their copyright for legal purposes i.e. it's their says if you can use it at all and you CANNOT just lift whole chunks and list where you got the stuff in an Appendix.
....and then it's the contributor's efforts too ...so for the sake of manners and "best practise" their permission also sought - and usually the condition is that the direct quote is attributed as you describe....but it is NOT a requirement.
This explains why any of the IPC magazines can print/quote threads without anyone's sayso, and frequently do. But again, they may often call and ask if "you're okay that we put in this piece you wrote" or at least, they have once or twice "run it past" me in the past, but there is technically no need.