Problem: Article: This was his first public appearance since an anti-corruption report asked for a judicial inquiry.
Mr Zuma, 74, is accused of an improper relationship with wealthy businessmen. He denies any wrongdoing.
Thousands of people took to the streets on Wednesday demanding his resignation.
The 355-page report entitled State of Capture focused on allegations that Mr Zuma allowed the Guptas, a wealthy Indian business family close to the president, to influence cabinet appointments.
The Gupta brothers have not commented, but they have previously denied any wrongdoing.
Mr Zuma, who spent 10 years as a political prisoner on Robben Island with Nelson Mandela during apartheid (white minority rule), told a cheering crowd in his home province of Kwa-Zulu Natal: "I'm not afraid of jail. I've been to jail during the struggle.
"There's no longer any space for democratic debate. The only space there is for court arguments by lawyers. That's not democracy," he added.
Mr Zuma, who is also the leader of the governing African National Congress (ANC), has been dogged by corruption allegations for more than a decade. He had tried to block the release of the report, but dropped his court bid.
He faces a vote of no confidence in parliament next week. He survived two similar votes earlier this year.
Answer: [[South Africa's embattled President Jacob Zuma has said he is not scared of going to prison, days after an investigation found evidence of possible government corruption.]]

Problem: Article: They have competed together for several years, coming fifth at the Olympics and taking European gold in 2012.
However, Couch was paired with 16-year-old Lois Toulson at last week's National Cup, where they came second.
"It wasn't great, to be honest," Couch, 26, told BBC Spotlight.
"Especially as we're leading up to the World Cup in less than a month, so being apart for a month and a half was not great preparation for it."
The duo are hoping to secure an Olympic Games qualification spot at the event, which is also being held in Brazil.
Barrow had been dropped from the 10m synchro line-up following a series of shin injuries but the Plymouth divers have been selected as part of a 15-strong GB World Cup squad, which includes Tom Daley.
"We're just going to put it to the side - we're back together in synchro now so there's a lot of hard training coming up," added Couch.
Answer: [[Great Britain diver Tonia Couch has admitted her split with 10m synchro partner Sarah Barrow was "not great preparation" for next month's World Cup event in Rio.]]

Problem: Article: Award organisers posted on Facebook: "We have some really sad news. Calvin Harris has taken ill and will not be able to perform at tomorrow's show.
"He sends his sincere apologies. Get well soon, Calvin!"
On Twitter, the 30-year-old DJ is reported to have said: "No EMAs for me this weekend. Got some heart problems. Heading home to see if it can be fixed x."
Answer: [[Dumfries-born DJ Calvin Harris has withdrawn from the MTV European Music Awards because of illness.]]

Problem: Article: The ex-Blue Peter presenter said her career suffered after she was issued with a PIN (Police Information Notice).
She was given the PIN, sometimes called a Harassment Warning Notice, in 2014 for allegedly harassing the partner of her daughter's estranged husband.
Her accuser received a suspended 18-month prison sentence on Thursday.
Kayla Thomas was sentenced for perverting the course of justice. A spokesman for Cambridge Crown Court said Ms Thomas had given a false witness statement and was also subject to a three-month curfew.
The case has drawn attention to the issuing of PINs, which some claim are issued too frequently and without sufficient investigation.
Jordan, who currently co-presents the BBC's Songs of Praise, told BBC Radio 4's Today programme she felt "guilty until proven innocent", adding: "It is a horrible thing to be hanging over you for three years, for something you know you haven't done."
Speaking to BBC Two's Victoria Derbyshire programme,  she said: "I'm still reeling from it now. My integrity has been questioned and my sense of trust has flown out the window."
The presenter said she had signed the notice because she thought she had "no option", without realising it would go "on some sort of record".
She said the issuing of the notice and the media coverage it generated had had a "detrimental impact" on her charity work.
"Some of the charities I was working with I haven't heard from again," she told the BBC on Thursday.
Because signing a Police Information Notice does not mean admitting any wrongdoing, there is no right of appeal.
In 2015, a government report acknowledged that the lack of any procedure for appealing against a PIN "can feel very unfair to recipients".
"If somebody takes a dislike to you, they can make an allegation and you can be slapped with one of these notices," said Jordan.
"The notices last about a year, but I've since found out they can stay on your record for longer. The police are aware they are less than perfect."
Jordan presented Blue Peter from 1990 to 1996 and was its first black presenter.
Follow us on Facebook, on Twitter @BBCNewsEnts, or on Instagram at bbcnewsents. If you have a story suggestion email entertainment.news@bbc.co.uk.
Answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
[[BBC presenter Diane Louise Jordan said she has had "a tough three years" trying to clear her name after being wrongly accused of harassment.]]