Lychee-FD

Third-Party Notices

This repository vendors selected third-party code under third_party/ for the Lychee-FD demo and online serving pipeline. The notices below document the upstream projects, local integration changes, and license obligations for the vendored copies.

Step-Audio2

• Local path: third_party/Step-Audio2
• Upstream project: https://github.com/stepfun-ai/Step-Audio2
• License: Apache License 2.0
• Local license copy: third_party/Step-Audio2/LICENSE

The local copy is a reduced integration subset used by the Lychee-FD token2wav and realtime serving flow. When updating this subtree, keep the upstream Apache-2.0 license file with the vendored code and preserve file-level license headers.

One file in the vendored Step-Audio2 subset, third_party/Step-Audio2/flashcosyvoice/modules/hifigan_components/layers.py, contains an upstream attribution comment for code adapted from https://github.com/EdwardDixon/snake under the MIT license. The corresponding MIT license notice is included at third_party/Step-Audio2/incl_licenses/snake/LICENSE. If that code is kept vendored, retain both the attribution and the license notice when refreshing or replacing the Step-Audio2 subtree.

Model Weights

This repository and Docker image do not vendor model weights. Users who download Step-Audio2 or other model checkpoints must comply with the license terms published by the corresponding model providers.

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