Licences
Song Spark is built on open-source software and openly licensed AI models. This page lists every one of them and its licence. It is generated from Song Spark's own third-party notices, so the two always match.
Song Spark is © 2026 Gain Publications. It includes or uses the following third-party software and models. Each is used under its own licence, named below. Full licence texts are in each project's distribution.
Engine and models
- ACE-Step 1.5 models (the planner
acestep-5Hz-lm-1.7B-Q6_K.gguf, the generatoracestep-v15-turbo-Q8_0.ggufand the VAEvae-BF16.gguf, inmodels\): MIT License, the ACE-Step project. - acestep.cpp (the engine,
engine\ace-server.exe): MIT License, © 2023-2026 The acestep.cpp authors. - ggml (its tensor library,
engine\ggml*.dllandllama\ggml*.dll): MIT License, © 2023-2026 The ggml authors. - cpp-httplib (compiled into the engine): MIT License, © 2017 yhirose.
- Qwen3-Embedding (the text encoder,
models\Qwen3-Embedding-0.6B-Q8_0.gguf): Apache License 2.0, the Qwen team (Alibaba Cloud). - llama.cpp (the lyrics writer,
llama\llama-server.exe,llama\llama-server-impl.dll,llama\llama-common.dll,llama\llama.dll,llama\mtmd.dll): MIT License, © 2023-2026 The ggml authors. Built from github.com/ggml-org/llama.cpp at 23f83e056d88ddae0d56b01ccc65fa42ab6625f7. It includes cpp-httplib (MIT, © 2017 yhirose), nlohmann/json (MIT, © 2013-2022 Niels Lohmann), miniaudio (public domain / MIT No Attribution, David Reid), stb_image (public domain / MIT, Sean Barrett) and sheredom's subprocess.h (public domain, Neil Henning). - Phi-4-mini-instruct (the lyrics writer's model,
writer\Phi-4-mini-instruct-Q4_K_M.gguf, converted to GGUF and quantized by Gain Publications with llama.cpp from huggingface.co/microsoft/Phi-4-mini-instruct): MIT License, © Microsoft Corporation (full text below). - NVIDIA CUDA runtime 12.9.1 (
cudart64_12.dll,cublas64_12.dll,cublasLt64_12.dll, beside the app): © NVIDIA Corporation. Redistributed unmodified under the NVIDIA Software License Agreement and CUDA Supplement (Attachment A: the CUDA Runtime and cuBLAS are redistributable), for use as part of Song Spark only and only with NVIDIA GPUs. Obtained from NVIDIA's redistributable archives (developer.download.nvidia.com/compute/cuda/redist, release 12.9.1). Users need only an NVIDIA driver (525 or newer). - Microsoft Visual C++ runtime and OpenMP runtime (
vcruntime140*.dll,msvcp140*.dll,vcomp140.dll, beside the app): redistributed under the Microsoft Visual Studio redistributable licence terms.
The app and its runtime
- .NET 8 runtime 8.0.33 (Song Spark carries its own copy:
coreclr.dll, theSystem.*libraries and the rest of Microsoft.NETCore.App): MIT License, © .NET Foundation and Contributors. The third-party code it contains is listed inTHIRD-PARTY-NOTICES.TXTin the Microsoft.NETCore.App.Runtime.win-x64 8.0.33 package. - Windows App SDK 2.6.5 (WinUI 3 and the Windows App SDK's .NET projections,
Microsoft.WinUI.dll,Microsoft.Windows*.Projection.dll,Microsoft.WindowsAppRuntime.Bootstrap*.dlland others): © Microsoft Corporation. Used under the Microsoft Software License Terms for the Microsoft Windows App SDK (license.txtin the Microsoft.WindowsAppSDK 2.6.5 package). The Windows App Runtime itself is installed by Windows as a separate framework package. - Windows ML Runtime 2.4.89 (
Microsoft.ML.OnnxRuntime.dll,Microsoft.Windows.AI.MachineLearning.Projection.dll; brought in by the Windows App SDK, not used by Song Spark): © Microsoft Corporation. Used under the Microsoft Software License Terms for the Microsoft Windows ML Runtime (license.txtin the Microsoft.Windows.AI.MachineLearning 2.4.89 package); its own third-party notices are in that package'sThirdPartyNotices.txt. - System.Numerics.Tensors 9.0.0 (brought in with the Windows ML Runtime): MIT License, © Microsoft Corporation.
- The C#/WinRT projection of the Windows SDK (
Microsoft.Windows.SDK.NET.dll,WinRT.Runtime.dll, from Microsoft.Windows.SDK.NET.Ref 10.0.22621.57): © Microsoft Corporation, under the Windows SDK licence terms (aka.ms/WinSDKLicenseURL). - Microsoft Edge WebView2 SDK 1.0.3719.77 (
Microsoft.Web.WebView2.Core.dll,Microsoft.Web.WebView2.Core.Projection.dll,WebView2Loader.dll; brought in by the Windows App SDK, not used by Song Spark): © Microsoft Corporation, under Microsoft's BSD-style licence (full text below). Song Spark ships no WebView2 runtime. - CommunityToolkit.Mvvm 8.4.2 and CommunityToolkit.Common 8.2.1 (the view models): MIT License, © .NET Foundation and Contributors.
- Windows Community Toolkit 8.2.251219 (CommunityToolkit.WinUI.Controls.SettingsControls, .Controls.Segmented, .Extensions, .Helpers and .Triggers: the Settings page's cards and the segmented choices): MIT License, © .NET Foundation and Contributors.
- Microsoft.Extensions.DependencyInjection 10.0.14 and its .Abstractions: MIT License, © Microsoft Corporation.
Song Spark's text uses Windows' own fonts (Segoe UI Variable, Segoe Fluent Icons); it ships none.
Phi-4-mini-instruct: the licence
The model is distributed under this licence (the model repository's LICENSE):
Microsoft. Copyright (c) Microsoft Corporation. MIT License Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Microsoft Edge WebView2 SDK: the licence
The package's LICENSE.txt:
Copyright (C) Microsoft Corporation. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * The name of Microsoft Corporation, or the names of its contributors may not be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Where to read each licence
The full text of each licence named above:
The NVIDIA and Microsoft Visual C++ runtimes and the Microsoft components named above are redistributed under their publishers' own licence terms, which come with each of them. Questions: support@gainpublications.com.
This website
- No web fonts: the pages use the fonts already on your device (Segoe UI on Windows).
- No scripts, trackers or third-party services. See the privacy policy.