A similar thing happens with WhatsApp, only with encryption added. The sender first encrypts the video, with a randomly generated key, before uploading via HTTP to WhatsApp's servers. This means that WhatsApp can't decrypt the files on their serve

I don't know the specifics of WhatsApp encryption techniques. But if the encryption is remotely up to par with today's standards and properly implemented, you have a near zero-chance of decrypting the file without a password.

All uploaded databases are processed on-the-fly in server memory. We do not retain any private or personal information from your uploads. Since april 2014 we have succesfully decrypted 1,253,921 databases and have consumed a total of 4,356.79 gb in bandwi