I am not a lawyer. I am not your lawyer. I suspect that the common law legal systems would approach this via case law. Unless case law exists already I think t

I am not a lawyer. I am not your lawyer. I suspect that the common law legal systems would approach this via case law. Unless case law exists already I think that if you wanted to claim ownership of a file you'd need to present your case including expert witnesses and persuade a judge/jury of its validity.