GPLv3 should be enough for an app; AGPL adds additional protection for server-side/self-hosted projects. https://softwareengineering.stackexchange.com/questions

GPLv3 should be enough for an app; AGPL adds additional protection for server-side/self-hosted projects. https://softwareengineering.stackexchange.com/questions/142012/using-an-agpl-3-0-licensed-library-for-extra-functionality-in-an-ios-app https://softwareengineering.stackexchange.com/questions/1420... The MuPDF app is available under AGPLv3+. https://itunes.apple.com/us/app/mupdf/id482941798?mt=8 https://itunes.apple.com/us/app/mupdf/id482941798?mt=8 You will catch some flak for discouraging free commercial re-use. If you see your app or portions of it as more of a library for others to use then LGPL is an option that requires reciprocity. In an unusual case, a "lax" license was recommended for the reference Ogg/Vorbis audio codec implementation: https://lwn.net/2001/0301/a/rms-ov-license.php3 https://lwn.net/2001/0301/a/rms-ov-license.php3