Kim Kardashian and Kanye West sued a  co-founder of YouTube on Thursday claiming he violated a confidentiality  agreement by posting a video of the couple’s marriage proposal to his new  video-sharing website.

The couple’s lawsuit states Chad Hurley  wasn’t invited to the elaborate October 21 proposal at San Francisco’s AT&T  Park, but was allowed to stay because he signed an agreement not to post any  video or images from the event.

A moment to remember: Kim Kardashian and Kanye West  pictured shortly after he popped the question; the couple launched legal action  on Thursday against YouTube co-founder Chad Hurley over a video he  posted

Lawsuit: Chad Hurley posted footage of the couple’s  proposal on his website MixBit

West allowed other cameras to film the event  for possible broadcast on E! Entertainment Television, home to  his fiancee’s  show Keeping Up With the Kardashians, according to the  suit.

Hurley posted a fuzzy two-and-a-half minute  long video on his new website MixBit, that showed West proposing to Kardashian  while an orchestra played.

The video also showed the ensuing celebration  with Kardashian’s family and invited guests toasting the newly-engaged  couple.

Kardashian and West are seeking unspecified  damages from Hurley and his company, Avos Systems Inc.

‘Exclusive rights, such as those sold by  plaintiffs to publication of video of the event, are particularly valuable,’ the  lawsuit states. ‘If people  violate these rights … they are of substantially  diminished value.’

A message sent through MixBit seeking comment  from Hurley was not immediately returned.

West proposed to Kardashian on her 33rd  birthday; the couple’s first child North West was born in June.

Say cheese: While the Kardashian clan posted many  photographs on social media, the couple are displeased about unauthorised video  footage which Hurley took and shared of the moment of the proposal

Lavish proposal: Kanye presented his fianceé with a 15  carat diamond ring by Lorraine Schwartz as ‘PLEEEASE MARRY MEEEE!!!’ flashed on  the field’s scoreboard screen

Read more: DailyMail