FermiHDI 3rd Party Licensing Documentation

This document outlines the third-party software, applications, libraries, and source codes integrated into the FermiHDI environment. It details their license types, usage, criticality, restrictions, and explicit conditions concerning code distribution or open-sourcing.

Core C++ Dependencies (Data Plane & Operations)

DPDK (Data Plane Development Kit)

• License: BSD-3-Clause
• Usage: Utilized extensively in hd_storage_node, hd_storage_controller, hd_message_bus_ingester, and libfermihdi_transport for kernel bypass networking and zero-copy User Space memory isolation.
• Criticality: High. Crucial for the extreme throughput required by the FermiHDI interconnect.
• Restrictions: Requires distribution of the copyright notice and license text.
• Distribution/Attribution: Attribution is strictly required in all binaries and documentation.
• Impact on Codebase: Does not require FermiHDI code to be open-sourced. Fully compatible with closed-source commercialization.

SPDK (Storage Performance Development Kit)

• License: BSD-3-Clause
• Usage: Used directly in libfermihdi_storage to communicate directly with NVMe drives bypassing kernel interrupts.
• Criticality: High. Essential for millions of IOPS disk access on the Storage Nodes.
• Restrictions: None beyond standard BSD redistribution notices.
• Distribution/Attribution: Attribution required.
• Impact on Codebase: Does not force FermiHDI to be open source.

Apache Arrow

• License: Apache License 2.0
• Usage: In-memory columnar data formatting during Storage Node filtering and query aggregation phases.
• Criticality: High. Critical for the analytic math throughput.
• Restrictions: Requires including the Apache 2.0 license, a NOTICE file (if they provide one), and stating any significant modifications made to Arrow code.
• Distribution/Attribution: Attribution and Apache 2.0 license presentation required.
• Impact on Codebase: Does not force FermiHDI to be open source.

OpenSSL (v3.0+)

• License: Apache License 2.0
• Usage: Core telemetry encryption, mTLS bindings in the proxy, and internal cluster identity management.
• Criticality: High. FermiHDI cannot operate securely without it.
• Restrictions: Standard Apache 2.0 restrictions apply.
• Impact on Codebase: Does not force FermiHDI to be open source.

nlohmann/json

• License: MIT License
• Usage: Parsing Control Plane JSON schemas and configurations in C++ nodes.
• Criticality: Low/Medium. Replaceable, but extensively used.
• Impact on Codebase: Does not force FermiHDI to be open source.

Sentry Native (sentry-native)

• License: MIT License
• Usage: Capturing C++ crash dumps and propagating OTel Trace IDs dynamically.
• Criticality: Medium.
• Impact on Codebase: Does not force FermiHDI to be open source.

Go Dependencies (Control Plane)

OpenTelemetry Go (go.opentelemetry.io/otel) & OpAMP (opamp-go)

• License: Apache License 2.0
• Usage: Distributed tracing, metrics generation, and WebSocket dynamic configuration pushed from the DMS.
• Criticality: Medium/High. Required to fulfill enterprise telemetry compliance.
• Impact on Codebase: Does not force FermiHDI to be open source.

Sentry Go (getsentry/sentry-go)

• License: MIT License
• Usage: Capturing Go panics in the Proxy and DMS instances.
• Criticality: Medium.
• Impact on Codebase: Does not force FermiHDI to be open source.

JSONSchema Go (github.com/xeipuuv/gojsonschema)

• License: Apache License 2.0
• Usage: Validation of the strictly defined Node configurations mapped by the DMS.
• Criticality: Medium.
• Impact on Codebase: Does not force FermiHDI to be open source.

Web UI Dependencies (Astro/Javascript)

Astro & Vue.js

• License: MIT License
• Usage: Powers the frontend routing, DOM generation, and reactivity of the Deployment Management System WebUI.
• Criticality: Medium. Strictly visual representations of the DMS API.
• Impact on Codebase: Does not force FermiHDI to be open source.

Chart.js & Vue-ChartJS

• License: MIT License
• Usage: Analytics dashboards inside the DMS UI.
• Impact on Codebase: Does not force FermiHDI to be open source.

Playwright

• License: Apache License 2.0
• Usage: Executed only in CI environments and testing suites simulating E2E telemetry visually.
• Criticality: Low. Dev/Test dependency only.

Summary Conclusion

There are zero "copyleft" style licenses (like GPL, AGPL, or CDDL) compiled into the primary distribution paths of HD. All third-party libraries have been vetted as commercially permissive (MIT, BSD, Apache 2). The system natively allows you to commercialize, distribute, and protect the entirety of the closed-source codebase safely provided you include an ATTRIBUTIONS.txt file releasing the standard copyright notices required by the libraries above.