It was alleged the victim was raped while sleeping in a car outside the party venue.
The judges found evidence of a key state witness to be unreliable and contradictory.
The judges said the law was clear that consent was absent if a victim was unconscious, asleep or under the influence of alcohol to the extent that the victim's consciousness or judgment was adversely affected.
They said no evidence was produced to prove that "four glasses of wine and the mix of vodka and Coke consumed by the complainant caused her judgment or consciousness to be adversely affected".
"Given that it was the complainant's own evidence that this quantity of alcohol was not excessive, I think the mere consumption falls far short of proof beyond reasonable doubt that there was a diminution or impairment of her faculties in a sense that her sensibilities were either dulled or that she had an exuberant or over-optimistic frame of mind which caused her to take risks."
Ngcanga said all he wanted to do was to register at NMU to finish his Master's degree.
He said at the time of his conviction, he was serving as deputy president of the Golden Key International Honours Society and had been invited to conferences in Boston, Atlanta, Paris, New Orleans and Dubai.
The NPO was founded in 1977 to recognise academic achievement among college and university students.
"I'm talking to my lawyers to see if the state can compensate me for the two years I spent in prison for a crime I did not commit," Ngcanga said.
Cleared of rape, man walks out of jail after 2 years
A Mdantsane man who was jailed for eight years for rape walked out of St Alban's Prison in Port Elizabeth, Eastern Cape, recently after spending two years inside for a crime he did not commit.
The rape conviction ended 27-year-old Osiphesona Ngcanga's life as an assistant lecturer of law at Nelson Mandela University (NMU) and as a maritime law Masters student.
He was found guilty by Port Elizabeth magistrate Nolitha Bara of raping a "drunk and unconscious" commerce student at a 21st birthday party on February 11 2017.
But on January 14, Makhanda High Court judges Sunil Rugunanan and Buyiswa Majiki upheld his appeal.
In their judgment, they said Ngcanga and the woman had been seen by one of six witnesses dancing together, laughing, flirting, kissing and talking to each other outside a party attended by 17 people, many of them students. Alcohol was consumed at the event.
One witness said the woman's friends had disapproved and kept calling her back into the house, but she had repeatedly returned to Ngcanga of her own accord, the judges found.
It was alleged the victim was raped while sleeping in a car outside the party venue.
The judges found evidence of a key state witness to be unreliable and contradictory.
The judges said the law was clear that consent was absent if a victim was unconscious, asleep or under the influence of alcohol to the extent that the victim's consciousness or judgment was adversely affected.
They said no evidence was produced to prove that "four glasses of wine and the mix of vodka and Coke consumed by the complainant caused her judgment or consciousness to be adversely affected".
"Given that it was the complainant's own evidence that this quantity of alcohol was not excessive, I think the mere consumption falls far short of proof beyond reasonable doubt that there was a diminution or impairment of her faculties in a sense that her sensibilities were either dulled or that she had an exuberant or over-optimistic frame of mind which caused her to take risks."
Ngcanga said all he wanted to do was to register at NMU to finish his Master's degree.
He said at the time of his conviction, he was serving as deputy president of the Golden Key International Honours Society and had been invited to conferences in Boston, Atlanta, Paris, New Orleans and Dubai.
The NPO was founded in 1977 to recognise academic achievement among college and university students.
"I'm talking to my lawyers to see if the state can compensate me for the two years I spent in prison for a crime I did not commit," Ngcanga said.