Indemnity Is Not Ownership

A reasonable inference on first hearing that Anthropic indemnifies customers for copyright claims over model output: if they'll pay for it, they must think it's theirs. The terms say the opposite, and the two clauses sit a few sections apart.

The assignment clause

Consumer Terms of Service, effective 2025-10-08, Section 4:

"Subject to your compliance with our Terms, we assign to you all our right, title, and interest (if any) in Outputs."

Commercial Terms of Service, effective 2025-06-17:

"Subject to Customer's compliance with these Terms, Anthropic hereby assigns to Customer its right, title and interest (if any) in and to Outputs."

Two things in one sentence. The vendor claims nothing: it assigns away. And the parenthetical "(if any)" is the vendor agreeing with the copyright offices that there may be nothing to assign. Whatever rights could exist in an output, they end up with the user, not the vendor.

The indemnity clause, and where it isn't

The Commercial Terms contain the defence promise, quoted here as excerpted:

"Anthropic will defend Customer and its personnel, successors, and assigns from and against any Customer Claim...alleging that Customer's paid use of the Services...or Outputs generated through such authorized use violates any third-party intellectual property right."

It comes with exclusions. As summarised from the same section: claims arising from the customer's modifications to outputs, from combining outputs with non-Anthropic technology, from customer-provided inputs, from knowing misuse, from practising patented inventions found in outputs, and from trademark use.

The Consumer Terms have no such clause. Their Section 11 disclaims warranties, including non-infringement, and the only indemnity flows from the user to the vendor.

So the promise is a contractual defence against third parties, offered on paid commercial use, hedged by exclusions, and absent from consumer plans. It is insurance for exactly the inbound risk described in the other note: the model may reproduce material that belongs to someone else. A vendor claiming ownership wouldn't need to insure you against that; it would be the defendant.

Why the two fit together

Read side by side, the clauses are coherent:

• Assignment: "whatever this is, it's yours."
• Indemnity: "and if it turns out to contain someone else's, we'll stand behind you, under conditions."

Neither says "we made this, it's ours". The reverse inference fails because it assumes indemnity is a property claim. It's a risk allocation.

What this changes in practice

For a one-person project on a consumer plan: nothing to rely on. The defence clause isn't there, and even where it is, the exclusion for modifications would bite any code that has been edited after generation, which is all of it. The only real protection remains not letting foreign expression in: Clean-Room Reimplementation With an Agent.

Not checked

• Which Anthropic terms actually govern a Claude Code session on a given subscription. The consumer/commercial split is stated in the terms; the mapping of plans to terms was not verified.
• The full text of the indemnity clause. The quote above is excerpted; the ellipses are in the excerpt, not mine to fill.
• Whether other vendors' terms follow the same pattern. Only Anthropic's were read.