Nicovideo geoblocking question

[hakanai]

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This URL: http://www.nicovideo.jp/watch/1503475085

Gives the usual error for Japan-only videos even in a browser, which is why this isn't a bug report. When using youtube-dl, I get:

ERROR: niconico reports error: domestic_video

If I provide credentials, I get this instead:

ERROR: Unable to download webpage: HTTP Error 403: Forbidden (caused by HTTPError()); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

I don't think this inconsistency is necessarily an issue, but my actual problem is that no matter what I have tried to get around this blocking, it doesn't seem to work. So I'm wondering if anyone knows exactly what kind of geoblocking nico is using.

Tried so far:

• Connecting through web proxy running in Linode Tokyo 2
• Connecting through a Cisco-IPSEC VPN running in Linode Tokyo 2
• Running youtube-dl itself from the shell of a node running in Linode Tokyo 2
• Connecting through an L2TP/IPsec VPN from VPN Gate
• Editing my user account info to say I'm from Japan

Surely the issue isn't that they have realised people use VPNs and blocked all networks which people use for hosting servers as well? That would ruin things for everyone.