TL;DR: Anthropic assigns all rights in Claude outputs to the user. No copyright encumbrance on generated code. Safe for any OSS license (ISC, MIT, Apache-2.0, GPL, etc.).
"you retain any right, title, and interest that you have in such Inputs" "we assign to you all our right, title, and interest (if any) in Outputs"
Source: Anthropic Consumer Terms of Service
The "(if any)" qualifier reflects legal uncertainty about whether AI outputs are independently copyrightable under current law -- not a limitation on the transfer itself.
"Customer (a) retains all rights to its Inputs, and (b) owns its Outputs." "Anthropic hereby assigns to Customer its right, title and interest (if any) in and to Outputs." "Anthropic may not train models on Customer Content from Services."
Source: Anthropic Commercial Terms of Service
Goes further: explicit assignment + no-training guarantee.
"we will defend our customers from any copyright infringement claim made against them for their authorized use of our services or their outputs, and we will pay for any approved settlements or judgments"
Source: Expanded Legal Protections (Jan 2024)
- No Anthropic copyright claim -- Anthropic explicitly assigns any interest it might have in outputs to the user
- User controls licensing -- since Anthropic claims no ownership, the user is free to submit code under any license (ISC, MIT, Apache-2.0, GPL, BSD, etc.)
- No copyleft contamination -- there is no Anthropic-side license that could propagate restrictions
- Indemnity available -- commercial API users get copyright defense from Anthropic
Anthropic actively supports open source development:
- Program: Claude for Open Source
- Offer: 6 months free Claude Max 20x subscription (~$1,200/developer value)
- Scale: 10,000 subscriptions available ($12M total program value)
- Eligibility: Core maintainers of public GitHub repos with 5,000+ stars or 1M+ monthly downloads
- Announced: February 2026
This program demonstrates Anthropic's commitment to the open source ecosystem and its confidence that Claude-assisted code is compatible with open source licensing.
- Consumer Terms of Service -- output assignment clause
- Commercial Terms of Service -- "Customer owns its Outputs"
- Expanded Legal Protections -- copyright indemnity
- Claude Code Legal & Compliance -- which terms apply per tier
- Claude for Open Source -- free subscriptions for OSS maintainers