I believe you refer to AGPLv3: https://www.gnu.org/licenses/why-affero-gpl.html https://www.gnu.org/licenses/why-affero-gpl.html "It has one added requirement:

I believe you refer to AGPLv3: https://www.gnu.org/licenses/why-affero-gpl.html https://www.gnu.org/licenses/why-affero-gpl.html "It has one added requirement: if you run a modified program on a server and let other users communicate with it there, your server must also allow them to download the source code corresponding to the modified version running there." Notably, the Canvas learning management system is licensed this way, and all of their JavaScript is unminified so you can download it from the server.