I couldn't do it either, it gets transcoded. AFAICT, they all transcode, even in HD, and the web codec used is rate limited. Which makes sense, because if they didn't, the high movement would peak the bandwidth, chopping it up and taking up several other slots in bandwidth.

Rate limiting codecs give up quality in panning and high-action scenes to keep the bit rate down.

I'm afraid that you're either stuck with a HD service from a normal site or, you could post it to a normal site like YouTube and linking the original to a file sharing site, file-based, one that doesn't require membership.

To protect it, you could pack the file with a password. WinRAR (if you own one) is notoriously harder to crack open after encryption relative to free zip.

Large Zipped files with decent passwords is also very hard to knock, as the weakness of Zip lies in non-solid archiving.