Still, maybe with these elements removed they could have a case.
Edit - As an example: https://www.techdirt.com/articles/20130304/18411522197/insan...
You have the right to free expression, but that doesn't mean you can exercise that right on my wall.
The edge cases are more complex than I have stated, in both countries, but courts have definitely had to answer the question “is it copyright infringement to load a computer program from (tape|drive|etc) into RAM”, so it’s not like they don’t know the simple definition is problematic.
https://en.m.wikipedia.org/wiki/Glider_(bot)
https://en.m.wikipedia.org/wiki/MAI_Systems_Corp._v._Peak_Co....
I'm not a lawyer so I wouldn't try to give you advice. I believe though you are asking about fair use and a lot has been written about that.
It just can't contain any uniquely identifiable sentence fragments from any other novel. And you know people will be checking it particularly closely against the sentences in "It".
And you'd better be sure not to say "Pennywise" anywhere, as that would be a trademark character. The bridge of the Enterprise-D is a trademark set design.
I wonder what the longest block of text is on the internet that two people independently wrote.
If someone claimed to write an original work that was exactly the same as It, a 1200-page novel, nobody would accept that it was independently written, even if we can't exactly pin down the word count at which we draw that line.
Not more than a couple of dozen words I would think. The number of possible combinations is astonishingly high.
You might find this interesting: http://rstudio-pubs-static.s3.amazonaws.com/187848_0ec906d62...