Content Attribution

Last updated: March 23, 2026

PREPD ships with pre-loaded content from openly licensed knowledge sources — 60 GB on Standard, 150 GB on Pro. We do not create this content. We curate, package, and distribute it in accordance with each source’s original licence. All credit belongs to the original authors and communities.

Content is delivered in ZIM format and served by Kiwix, an open-source offline content reader.

Pre-loaded content libraries

Source	Description	Licence
Wikipedia	Top-quality English encyclopedia articles (WP1 0.8 selection)	CC BY-SA 4.0
Wikibooks	Open textbooks and manuals	CC BY-SA 3.0
Wikivoyage	Worldwide travel guide	CC BY-SA 3.0
Wikispecies	Directory of species taxonomy	CC BY-SA 3.0
Appropedia	Sustainability, appropriate technology, and development	CC BY-SA 4.0
MDWiki (Medical)	Medical encyclopedia for clinical and field reference	CC BY-SA 3.0
WikEM	Emergency medicine reference	CC BY-SA 4.0
Project Gutenberg	Classic literature and fiction (Language & Literature, American)	Public Domain
PhET Simulations	Interactive science and math simulations	CC BY 4.0
The World Factbook	Country profiles, demographics, and geography	Public Domain (US Gov)
USDA Nutrition Database	Nutritional data for food items	Public Domain (US Gov)
OpenStreetMap	North America offline maps	ODbL 1.0
Energypedia	Renewable energy and energy access	CC BY-SA 4.0
Art of Problem Solving	Mathematics education and problem-solving	CC BY-SA 3.0
Stack Exchange	Community Q&A covering: DIY, Cooking, Outdoors, Gardening, Mechanics, Ham Radio, Sustainability, Lifehacks, Homebrewing, Bicycles, Fitness, Woodworking, Earth Science	CC BY-SA 4.0

ZimGit collections

Curated topic bundles from the ZimGit project:

Post-Disaster Recovery
Water Purification & Treatment
Medicine & First Aid
Food Preparation & Preservation
Knots & Rope Work

ZimGit content is sourced from various openly licensed materials compiled by the openZIM project.

Software & source code

PREPD is built on open-source software including Raspberry Pi OS, Kiwix, nginx, dnsmasq, and hostapd. For the full software component list, licence details, and our GPL source code offer, see the Open Source page on offgridnode.com.

Licence summary

CC BY-SA (Creative Commons Attribution-ShareAlike): You may share and adapt the content for any purpose, including commercial, provided you give credit and distribute adaptations under the same licence.
CC BY (Creative Commons Attribution): You may share and adapt the content for any purpose with credit to the original creator.
ODbL (Open Data Commons Open Database License): You may share and adapt the database with attribution and share-alike for derived databases.
Public Domain: No copyright restrictions. Free to use for any purpose.

Thank you

PREPD exists because of the global community of contributors, editors, and volunteers who build and maintain these knowledge libraries. Every Wikipedia editor, every Stack Exchange contributor, every Project Gutenberg volunteer, every open-source developer: you make offline knowledge possible. Thank you.