What are the actual requirements for a perjury conviction in the USA? Does the witness have to be intentionally lying? Presumably you don't prosecute someone fo

What are the actual requirements for a perjury conviction in the USA? Does the witness have to be intentionally lying? Presumably you don't prosecute someone for being mistaken, misguided or over-confident in their own abilities? It doesn't sound like Carmack was accusing the witness of lying, but rather they they believed a bit too much in their own pet theory about how to detect copying in code. I don't usually like to comment on trials, but I think perhaps he has a point here. If there were a reliable method for detecting 'non-literal copying' of code, then the person who made it should be making a killing by selling refactoring tools.