[boplicity]

> If I use a sentence or even a paragraph from a copyrighted book, it's not copyright infringement.

Note that this may not actually be true, and you may need to pay to license even shorter excerpts of creative work. Copyright is a complex topic. It's not always safe to assume that you have the rights you think you have, in terms of reproducing others' work.

For example: "The proportion of a total work is not the only factor, though. If you are including the most crucial aspect of a work, even if it is only a small part, then the question of “substantiality” comes into play." [1]

[1] https://www.dukeupress.edu/getmedia/3363cb6e-04b6-43ec-b004-...