Here's the code (in JavaScript and Python) to make the cKey for downloading stuff from WeTV. This works for encryption version 8.1. Both versions accept the same arguments, first 5 (vid, tm, appVer, guid and platform) are the same as in the call to https://play.wetv.vip/getvinfo. url is optional for JavaScript but required for Python - that's the URL of the page you're on. userAgent, referer, navCodeName, navName and navPlatform are optional, check the code for default values.
makeCKey(/* arguments here */);