Question about the Asset Store:How do i sell soundtracks?

I mean how do copyrights work for the soundtrack?
I have several music pieces that i want to sell but i dont think that there is any option to sell 1 original copy digitally to one person that likes the music after checking it on a streaming service to use solely on his own project and not say have it bought from another person running a different project.
I wanted to start selling packs of music but i have this issue foremost and secondly aside from composing,the arranging and mixing of instrument samples need some work to sound good
you can check out some prototypes

If you like what you hear i will possibly upload a pack on the asset store(improved)…
Thanks in advance for feedback and your time!!!

there is no way to sell exclusive content on the marketplace, sorry. You can only sell infinite number of licenses to use your royalty free non exclusive content.