Ruling on those basis in a case doesn't make that the only test for whether something infringes copyright or not. You have to qualify for all of those things.

Ruling on those basis in a case doesn't make that the only test for whether something infringes copyright or not. You have to qualify for all of those things. Also, there were four tests. The general principle of the ruling is that: - it was mostly about APIs; organization rather than implementation. - it was sufficiently transformative - it was a small amount of code of insubstantial value - it was serving a different market So, I suppose you have indeed proven that we can have different interpretations of copyright law. Taking a small but substantial piece of implementation code and using it in a similar way for a similar purpose to solve a similar problem would appear to fail all of those tests, and at least to me smells like rancid infringement.