Dude Who Videoed Our Engagement LAME AND BLIND

The guy who Kim Kardashian and Kanye West are suing for secretly videotaping their engagement is not only sneaky ... he's blind -- at least according to the judge.

Chad Hurley -- who co-founded YouTube -- claimed when he videotaped the proposal at AT&T Park in San Fran and later released it on his website MixBit ... he had no idea he had signed a confidentiality agreement.

The case was in court Tuesday -- Hurley was trying to get it dismissed -- but the judge scoffed at him, saying the entire document Hurley signed was 1 page and at the top the words CONFIDENTIALITY could not possibly be missed.

Kanye and Kim could score a huge payday, courtesy of their lawyer, Eric George ... because the judge said Hurley could be liable for fraud, which opens the door to punitive damages ... which theoretically could mean millions of dollars.  Hurley has the money -- Google bought YouTube for $1.6 billion.

The motion to throw the case out was denied.  So full steam ahead.