Widevine documentation

I'm trying to download the following docs from Widevine website:

• Widevine DRM for HLS: https://storage.googleapis.com/wvdocs/Widevine_DRM_HLS.pdf
• Getting Started with Widevine DRM: https://storage.googleapis.com/wvdocs/Widevine_DRM_Getting_Started.pdf
• Common Encryption API for Widevine DRM: https://storage.googleapis.com/wvdocs/Widevine_DRM_Encryption_API.pdf

But I get AccessDenied page. Is there any special authorization required to obtain them? I tried to contact Widevine team using contact form but still got no response.

Access to Widevine documentation is now restricted to licensees. (widevine.com/news)