Once you share an idea with someone else, either through speech or action, you have no control over how others use that idea without trespassing against their real property rights.

Suppose I own a CNC machine. If I see an object, and think i can reproduce it or even improve upon it, the new idea is mine and the machine is mine. The "law" says it is "illegal" for me to use my own machine to violate someone else's "intellectual property," but this is a real infringement of my real rights to real property. Once I make my object, the idea is open to anyone else doing the same with my idea, because it is no longer something I can own when it is open to the world.

Does this help clarify the idea I am trying to express? the same idea applies to music - I can own the idea of a song, but once I record and release it, others have the right to use their own computers, instruments, voices, etc, to reproduce and improve it regardless of my wishes, because I do not have authority over them or their property. Software code, literature, etc. are similar too.