Two porn companies are locked in a battle for the rights to the newly discovered Tupac Shakur sex tape.

A five-minute video has surfaced which allegedly shows the rapper walking into a room with his trousers around his ankles before receiving oral sex from an unidentified woman and website YouPorn has already made a $150,000 offer for the footage, according to its founder Corey Price.

According to TMZ.com the unnamed seller is believed to be unhappy with the bid claiming it is "way too low" and is currently in negotiations with a second site, which is willing to pay more but only if it can screen the tape first.

The footage was filmed during a house party in 1991 and also features a shirtless Tupac, with a drink in one hand and what is thought to be a marijuana cigarette in the other, singing and dancing along to one of his own unreleased songs and engaging in conversation with Money B from rap group Digital Underground while the woman continues the act.

Tupac died from injuries sustained in a drive-by shooting in 1996 at the age of 25.