(Cover) - US Showbiz - Kim Kardashian's sex video value has been placed at $30 million.

The reality star taped herself having intimate relations with singer Ray J while they were in a relationship but the video made its way onto the market back in 2007.

The video has been very successful and arguably helped to launch Kim's media career but now a mystery buyer wants to purchase the rights to take it off of the market.

According to TMZ who spoke to the tape's owner, Vivid Entertainment, the buyer will have to pay at least $30 million to stop copies being sold.

Vivid representative Steve Hirsch says that he has had contact with the lawyer negotiating the potential purchase for the mystery party.

"Based on its long term value, it looks like $30 million would be a starting point for a discussion on all of the rights," Steve revealed.

"I have no idea who is behind this offer but if it's Kim, I have a tremendous amount of respect for her. She has my number and can call me any time."

Kim, 30, has built a multi-million dollar fortune from various merchandising deals and television shows over the past few years.

She got married to basketball player Kris Humphries earlier this month in a lavish ceremony attended by 440 people.

But sales of the sex tape is said to have quadrupled during her wedding weekend with nearly two million people downloading the video.

(C) Cover Media