Ask HN: Is "no source code was copied" still a sufficient copyright defense?

The "no source code copied" defense is weakening as courts increasingly consider UI, UX patterns, and functional similarity as protectable elements, not just literal code. LLM-generated clones that reproduce look-and-feel without copying source may still face trade dress or unfair competition claims. Practitioners building AI-assisted tools should treat copyright risk as extending beyond code to interaction design and visual structure.