Just something I posted on a thread on DA which may go a small way towards explaining issues of plagiarized works...
......if 51% is original, that implies that 49% is not.
For a 'derivative' work to be considered not a copyright issue it must be sufficiently different to be a coincidental creation, and therefore not derived at all.
If an artist admits and credits a source of the derivation he is still in breach of the copyright as he has put the original artist's work to a use for which its release was not intended.
Any part, no matter how small, that is not your own is someone else's, and therefore not yours to use.
The comment that a 1% rip is a rip is correct.
It cannot be quantified....."oh, shucks...I done half of it so it's all mine..."
It is either ALL yours or it isn't.
If it isn't 'ALL YOURS' that part which isn't MUST have the owners permission to be used.
Credit is not enough. In fact, credit without permission is just a declaration of copyright theft....
What are your thoughts?