Synthesising material from various sources isn't copyright infringement, that's called writing. It's only infringement if the portion copied is significant eit

Synthesising material from various sources isn't copyright infringement, that's called writing. It's only infringement if the portion copied is significant either absolutely or relatively. A line here or there of the millions in the Linux kernel is okay. A couple of lines of a haiku is not. Copyright is not leprosy.