I'm researching how Widvine DRM works and I've read a lot of articles about it, now I was wondering if there is a way to implement a test server to build a license?

In Widvine's document, there is an address that is inactive now. If anyone knows about this, I would appreciate it if you could help me

Inactive link : https://storage.googleapis.com/wvdocs/wv-proxy-sample.tgz

One thing else, does anyone know how to decrypt the response of the below url?