Property rights can sometimes be a tricky subject to fully understand. It's usually taken for granted why property rights come to be and whether any authority has the right to declare something to be property versus another thing. What's commonly accepted for something to be considered property is it has to be owned by someone. Basically if you put forth that you are the proper owner of an entity, it has to be something tangible and you have to show how or at least verify by consensus that you are indeed the rightful owner.
IP assumes ideas can be owned and apart from being silly, this is a complete impossibility as every subsequent idea is borrowed from somewhere. If this wasn't the case we would never develop as a civilization. Now, you might from a practical standpoint have the ability to use an idea or creation though this just means it's within your possession, not as a rightful owner. In this way originality is not so much an isolated creation independent from the external world, but rather a mere posture and mash-up from various disparate sources.
In the Hip-Hop track by Gang Starr emcee Guru on the song "Take It Personal" expresses this issue cogently:
Rap is an art, you can't own no loops
It's how you hook 'em up and the rhyme style, troop
So don't even think you could say someone bit
Off of your weak beat, come on, you need to quit
I flip lines and rhymes that never sound like yours
There ought to be laws against you yapping your jaws
Originality overflows in me
And the truth is, that you wish you could live the
Life I live and kick the lyrics I kick
But bear in mind that you can't think this quick
So Premier drops beats for me to say verses to
And if I sound doper, then take it personal
You can't own loops(music samples) just like you can't own any other idea. Imagine if Satoshi decided he owned the idea of bitcoin and never uploaded that immortal code onto the public domain? Hip-Hop music in general shows how we can borrow from others while flipping them into a unique and original creation. You're judged by how well a community values the art, it doesn't matter where it comes from.