Built on the shoulders of open source.

EAS Station™ is assembled from dozens of open-source libraries, public government data feeds, and community standards. This page credits every one of them — and explains how EAS Station™ itself is licensed.

Dual-Licensed 60+ Dependencies Public Data Community Built

How EAS Station™ Is Licensed

Dual-licensed software — attribution and notices must be preserved.

EAS Station™ is dual-licensed. You may use it under the GNU Affero General Public License v3 (AGPL-3.0) or, for proprietary/closed-source deployments, under a Commercial License.

When using the software under the AGPL you must preserve the copyright and license notices and may not rebrand the software or remove attribution. The recommended attribution string is:

"EAS Station", its logos, and wordmarks are trademarks and are not covered by the software licenses — their use is governed by the Trademark Policy.

License Files

AGPL-3.0 Open-source use · see LICENSE

Commercial Proprietary use · see LICENSE-COMMERCIAL

NOTICE Attribution & trademark terms

Open-Source Software

The Python libraries that make every feature work.

Application Framework

Flask

Web framework, routing & templating BSD-3-Clause

Werkzeug

WSGI request/response plumbing under Flask BSD-3-Clause

Jinja2

Server-side template engine for every page BSD-3-Clause

Flask-SocketIO · python-socketio

Live WebSocket updates for alerts, radio & GPS MIT

Flask-WTF · Flask-Limiter · Flask-Compress

CSRF protection, rate limiting & compression BSD / MIT

Data Layer

SQLAlchemy

ORM behind every persisted entity MIT

GeoAlchemy2

PostGIS spatial extensions for SQLAlchemy MIT

Alembic

Schema migrations · runs on every install/update MIT

psycopg2

PostgreSQL database driver LGPL-3.0

pyshp · pyproj

Shapefile reading & CRS reprojection for boundaries MIT

Py-ART · boto3 · Cartopy · cmweather · Matplotlib

NEXRAD Level II radar decode, AWS Open Data access, and geographic PPI rendering — retained in-tree for future per-site radar detail, not currently in the live overlay path BSD-3-Clause / Apache-2.0 / MIT / Matplotlib License

Networking & Parsing

requests · httpx · certifi

HTTP clients & CA bundle for CAP/IPAWS polling Apache-2.0 / BSD / MPL-2.0

lxml

High-performance XML parsing for CAP ingestion BSD

BeautifulSoup4 · feedparser

HTML/RSS parsing for tickers & secondary feeds MIT

Signal & Audio

NumPy

Foundation for every IQ buffer, FFT & bit slicer BSD

SciPy

DSP filter design (deemphasis, channel, notch) BSD

Numba

JIT-compiles the SAME & RBDS demod workers BSD

pydub · audioop-lts · pyttsx3

Audio decode, resampling & offline text-to-speech MIT / Python-2.0

Hardware & Displays

pyserial · pynmea2

Serial I/O for displays & GPS NMEA parsing BSD / MIT

Pillow · luma.oled

Glyph/bitmap rendering for VFD & OLED frames BSD / MIT

gpiozero · rpi-ws281x · zigpy

GPIO relays, NeoPixel LEDs & Zigbee coordinator BSD / GPL-3.0

Security & Notifications

cryptography

Ed25519 signatures backing the tamper-evident audit log Apache-2.0 / BSD

PyOTP · qrcode

TOTP multi-factor auth & QR enrollment MIT

Twilio

SMS alert delivery & compliance notifications MIT

pysnmp

SNMP trap notifications to NMS platforms BSD

Runtime & Ops

Gunicorn

Production WSGI server fronting Flask MIT

gevent · greenlet

Async workers for thousands of WebSocket clients MIT

redis-py · hiredis

State, pub/sub & rate-limit store client MIT

psutil

System & process monitoring BSD

geoip2 · maxminddb

Visitor geolocation for Traffic Analytics Apache-2.0 / MIT

Infrastructure & System Packages

The platform services running underneath the application.

PostgreSQL + PostGIS

Spatial database & geographic alert filtering PostgreSQL / GPL-2.0

Redis

Metrics cache & inter-service messaging BSD-3-Clause

nginx

Reverse proxy & TLS termination BSD-2-Clause

certbot · Let's Encrypt

Automated certificate issuance & renewal Apache-2.0

Icecast

Audio streaming server for remote monitoring GPL-2.0

FFmpeg

Codec backend for stream transcoding/decode LGPL-2.1 / GPL-2.0

systemd

Native service orchestration LGPL-2.1

chrony

Stratum-1 NTP disciplined by GPS + PPS GPL-2.0

gpsd

Multiplexes the GPS receiver for chrony & dashboards BSD-3-Clause

SoapySDR

SDR receiver abstraction (system binding) Boost-1.0

eSpeak NG

Offline speech backend for pyttsx3 GPL-3.0

Frontend Assets

Self-hosted UI frameworks, icons & brand marks.

Bootstrap 5

Mobile-first responsive UI framework MIT

Font Awesome (Free)

UI iconography throughout the interface CC BY 4.0 / OFL / MIT

Chart.js

Analytics charts & sparklines MIT

Leaflet

Interactive maps for alert polygons & coverage BSD-2-Clause

Socket.IO client

Browser WebSocket client MIT

Mermaid

Diagrams rendered in docs & admin pages MIT

simple-icons

Brand marks for the tech-stack badges CC0-1.0

Flag assets

Country flags for Traffic Analytics Public domain / CC0

Data Sources & Standards

Public feeds and published standards the system is built around.

Source	Use	Terms
NOAA / NWS CAP feeds	Primary alert ingestion	U.S. Gov. public data
FEMA IPAWS / IPAWS-OPEN	Authenticated alert aggregation	U.S. Gov. public data
U.S. Census TIGER/Line	County/zone boundary geometry	Public domain
FIPS / SAME location codes	Geographic alert targeting	Public domain
Iowa Environmental Mesonet	NEXRAD Level III base reflectivity (WMS-T mosaic), the radar overlay's fallback when Level II isn't available	Public data, ISU
NOAA Level II Archive (AWS Open Data)	Raw per-site NEXRAD volume scans, the radar overlay's primary source	U.S. Gov. public data
NWS Radar Stations API	WSR-88D site coordinates, for picking the nearest radar to an alert	U.S. Gov. public data
MaxMind GeoLite2	Visitor geolocation (operator-supplied DB)	CC BY-SA 4.0
NRSC-4-B · VTEC · RBDS	Protocol implementation references	Industry standards
multimon-ng	Decoding-parity cross-check (not bundled)	GPL-2.0

GeoLite2 data is not distributed with EAS Station — operators supply their own MaxMind database.

Acknowledgments

Thank you to the communities behind this work.

Upstream Projects

The Pallets Projects Flask, Jinja2, Werkzeug, itsdangerous

PostgreSQL & PostGIS Teams Spatial database technology

RTL-SDR & SoapySDR Accessible software-defined radio

Community

Amateur Radio Community Testing, feedback, and field validation

Every Upstream Maintainer Whose work is credited on this page

For the complete, version-pinned list with full license details, see the canonical attribution documentation. Something missing or mis-licensed? Open an issue so we can correct the record.