There was a funny Microsoft license for Xlsx.js (a lib that read Excel files in browser): It was allowed to distribute freely… as long as it runs on Windows: >

There was a funny Microsoft license for Xlsx.js (a lib that read Excel files in browser): It was allowed to distribute freely… as long as it runs on Windows: > (F) Platform Limitation- The licenses granted in sections 2(A) & 2(B) extend only to the software or derivative works that (1) are run on a Microsoft Windows operating system product, and (2) are not Excluded Products. So you could not deliver it on Safari, but also not on Chrome if it ran on Mac. Aaaand that is why the JSXLSX implementation was developed, exactly the same as xlsx.js but without the restriction. https://github.com/stephen-hardy/xlsx.js/issues/8 https://github.com/stephen-hardy/xlsx.js/issues/8