Where is the line drawn with stealing?

It's obvious what stealing is when engaged-in often. You take the stuff of others while under a certain mental state, that mental state being marked and noticeable by an understanding that something isn't under your possession (but under another's), and physical effort to appropriate it regardless of the other person's wishes. So if someone is happy with you 'stealing' something, is that stealing? In general, no, as this would be a gift. On the other hand, we have situations such as copyright law, or other ideas where the line of 'possession' is inappropriately drawn. So here is the problem. What is the meter by which we can say something is stolen or not? It can't be the sweeping idea, 'this is my property', as that idea can be faked, as in the case of intellectual property. It can be a case where there is appropriate and inappropriate mental possession of items, and stealing only being the violation of the appropriate lines. Is it fully intent? Kamma = Intent, so if you do not engage in the intent of stealing, you will not experience the results. However, what if you are someone who considers smelling the flowers of another individual stealing? Surely that would not be considered stealing, yet to that person smelling the flowers would trigger the intent. Even though that coarse mental intent would arise, as far as I know that is not actual stealing, so the 'non-intent stealing' would not have an object. At which point can you say you are actually stealing, and at which you are not? It is really simple with coarse events but hard with complex contexts. Taking an apple from someone without asking is stealing, but what about abusing sales at a market? - what about when those sales are glitches, unintended, in the system? - what about liberally charging a corporate card? For our modern, daily situations a really subtle understanding of the precepts is required. So where is the subtle line of stealing?