Software never really developed a notion of plagiarism.

That is, the idea that idea fragments should be attributed.

Software engineers only tried to protect whole packages, not individual ideas inside them.

Software was expensive enough to make that if it wasn't a byte-for-byte copy it was considered kosher.

But now it's trivial to copy software just from a description.

This is changing what feels appropriate and what feels like copying.

Fable-class models have changed the calculus of what should be hoarded and what should be made public.

The risk/reward calculus of patents has changed.