LICENCE: GNU AGPL v3.0 

The code in x2t.js is a WASM build based on the OnlyOffice Core source from this repository:

https://github.com/ldubost/core/commits/wasm32-5.2.6

It is built using emscripten using docker:

https://git.xwikisas.com/caubin/onlyoffice-x2t-wasm/tree/master/x2t-wasm