For bugs to be fixed, changes have to be made. If software is unchanged, by definition it will have the original bugs. It's not always clear if software is act

For bugs to be fixed, changes have to be made. If software is unchanged, by definition it will have the original bugs. It's not always clear if software is actually changed. A changelog is useful in that regard, but you won't get that everywhere. Dated looks is a heuristic for: was build long ago, has had no changes since. Heuristics aren't proofs of course, but you so rarely get proofs in real life anyway.