Question: How long of a ban did Panahi have on film-making?
About the article "This Is Not a Film", section "Synopsis".

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Closed Curtain () is a 2013 Iranian drama film by Jafar Panahi and Kambuzia Partovi.
It premiered at the 63rd Berlin International Film Festival on February 12, 2013 where Panahi won the Silver Bear for Best Script.
It was shot secretly at Panahi's own beachfront villa on the Caspian Sea.
Panahi stated that he began shooting the film in a state of melancholy but managed to recover by the film's completion.
"Closed Curtain" is Panahi's second film since his 20-year ban on filmmaking after 2011's "This Is Not a Film".
The film was selected as the closing film of the 2013 Hong Kong International Film Festival. 
Panahi is married to Tahereh Saidi, who he first met while he was in college when she was working as a nurse.
Together they have a son, Panah Panahi, born in 1984 and a daughter, Solmaz Panahi.
Panah Panahi attended the University of Tehran and in 2009 made his first short film, "The First Film", which was screened at the 2009 Montreal World Film Festival.
His daughter Solmaz studied theater in Tehran. 
In 2006 Panahi made "Offside".
In the film, a group of young Iranian girls disguise themselves as boys to sneak into Azadi Stadium to watch the World Cup qualifying football playoff game between Iran and Bahrain.
The film was partially shot during the actual game it depicts.
Since the 1979 Islamic Revolution women have been banned from attending football matches in Iran on grounds of rowdy and aggressive language, lewd behavior, and seeing men in shorts and short sleeve shirts.
At one point Mahmoud Ahmadinejad had wanted to repeal the law but was overruled by the ulema.
Panahi has stated "I use the football game as a metaphor to show the discrimination against women on a larger scale.
All my movies have that topic at their center.
This is what I am trying to change in Iranian society."
The film was inspired by an incident several years earlier when Panahi's daughter was refused entry to a football stadium but ended up sneaking into the stadium anyway.
Knowing that the film would be controversial, Panahi and his crew submitted a fake script about some young men who go to a football match to Iranian authorities in order to get permission to make the film.
However before they began shooting the Ministry of Guidance, which issues licenses for films to be shown publicly, told Panahi in advance that because of his past films they would not issue "Offside" a license until he re-edited his previous films.
Not wanting to miss the World Cup tournament, Panahi ignored the Ministry and began shooting the film.
As usual, Panahi cast non-professional actors for the film, and the group of young girls in the lead roles were mostly university students that Panahi found through friends who all were passionate fans of football.
The film was shot in 39 days and in order to move unnoticed through large crowds Panahi used digital video for the first time so as to have a smaller, more inconspicuous camera.
Panahi also officially listed his Assistant Director as the Director of the film so as to not attract the attention of the Ministry of Guidance or the Disciplinary Forces of Tehran, but towards the end of the films shooting a newspaper article about the making of the film listed Panahi as the director and both organizations attempted to shut the film down and confiscate the footage.
Only a sequence that takes place on a bus remained to be filmed so Panahi was able to continue filming without being caught.
The film premiered in competition at the 2006 Berlin Film Festival, where Panahi was awarded with the Silver Bear Jury Grand Prix.
Like "The Circle" and "Crimson Gold" before it, "Offside" was banned from being shown in Iran.
Panahi had already set up distribution for the film all over Iran and the film was predicted to break all box office records.
Two days after being banned and twenty days before the World Cup championship game, pirated DVD copies of the film became available all over Iran.
Panahi has stated that of his films "Offside" is "probably the one that people have seen the most" in Iran.
After the film's release a feminist protest group in Iran called the White Scarf Girls began showing up at football matches carrying banners that read: "We don't want to be Offside" Sony Pictures Classics, the film's U.S. distributor, wrote a letter to the Ministry of Guidance in Iran requesting that the film be shown for at least one week in its home country so that they could launch a campaign to nominate the film for Best Foreign Language Film, but the Ministry refused. 
On 23 December 2010, Amnesty International announced that it was mobilizing an online petition spearheaded by Paul Haggis and Nazanin Boniadi and signed by Sean Penn, Martin Scorsese, Harvey Weinstein and others to protest the jail sentence of Panahi.
Cine Foundation International, a "non-profit film company and human rights NGO aiming to 'empower open consciousness through cinema'" announced on 3 January 2011 that they are launching a campaign of protest films and public actions calling for the release of Panahi.
"The campaign will include protest films that speak to human rights issues in Iran and throughout the world, six of which are commissioned feature-length, plus twenty shorts.
Participating filmmakers may act anonymously or through pseudonyms since voicing their stories can be dangerous.
The films, which will address themes of nation, identity, self, spiritual culture, censorship and imprisonment, will be aimed for public, web and various exhibition media".
Later in January, CFI deployed a video protest mechanism called White Meadows (named for the Mohammad Rasoulof film, The White Meadows, which was edited by Panahi) and developed by Ericson deJesus (of Yahoo!
and frog design) at the request of the foundation.
The video mechanism "allow(s) anyone in the world to record a short video statement about Panahi and Rasoulof.
There will be an ESCAPE button at top, allowing quick exit for those in countries where recording a statement would be dangerous.
There will an option to have the screen black, and soon, voice distortion.
The video statements will be recorded as mp4s, giving them maximum transmedia capacity, which essentially makes them broadcastable from any device that can show video".
Users can also use the mechanism to comment on how they would "like to see as an international response by the film industry", comment on the state of human rights in general, or to "report a human rights abuse to the world".
In his March 2011 greetings to the Iranian people on the occasion of the Iranian New Year, U.S. President Barack Obama cited Panahi as an example of the oppressive regime that currently controls the country of Iran.
In April 2011 Time Magazine named Panahi number 3 in their list of the Top 10 Persecuted Artists who have challenged authority.
In Spring 2011, Boston's American Repertory Theater and System of a Down's Serj Tankian dedicated their production of "Prometheus Bound" to Panahi and seven other activists, stating in program notes that "by singing the story of Prometheus, the God who defied the tyrant Zeus by giving the human race both fire and art, this production hopes to give a voice to those currently being silenced or endangered by modern-day oppressors".
On 26 October 2012, Panahi was announced as a co-winner of the Sakharov Prize of the European Parliament.
He shared the award with Iranian human rights lawyer Nasrin Sotoudeh.
European Parliament President Martin Schulz called the pair "a woman and a man who have not been bowed by fear and intimidation and who have decided to put the fate of their country before their own".
Catherine Ashton, the European Union High Representative of the Union for Foreign Affairs and Security Policy, stated of the prize, "I am following the case of Nasrin Sotoudeh and other human rights defenders with great concern ... We will continue to campaign for the charges against them to be dropped.
We look to Iran to respect the human rights obligations it has signed up to".
Panahi's daughter Solmaz accepted the award for Panahi.
In March 2013, Columbia University professor Hamid Dabashi wrote an article that was highly critical of Panahi and his decision to continue making films, and partially blames Panahi for the "tragic endings of Iranian cinema".
Dabashi had previous written extensively about and praised Panahi during the director's early career.
Dabashi called Panahi's two post-arrest films "self-indulgent vagaries farthest removed from" his previous films and wrote that Panahi "should have heeded the vicious sentence and stayed away from his camera for a while and not indulge, for precisely the selfsame social punch that have made his best films knife-sharp precise has now dulled the wit of the filmmaker that was once able to put it to such magnificent use.
"In June 2013 Panahi was invited to join The Academy of Motion Picture Arts and Sciences.
In August 2013, shortly after the election of Iranian President Hassan Rouhani, several well known political prisoners were released.
One such prisoner was Panahi's Sakharov Prize co-winner Nasrin Sotoudeh, whose release prompted European Parliament President Martin Schulz to say "We are eagerly waiting to welcome her in Strasbourg together with her Sakharov Prize co-winner, film director Jafar Panahi."
A few days earlier the famed House of Cinema, Iran’s largest professional guild for filmmakers, was re-opened after have been deemed illegal in January 2012. 
In 2000 Panahi made "The Circle", produced by Jafar Panahi Film Productions and Mikado-Lumiere&Co.
Although Panahi claimed that he was not a political filmmaker, his third feature was a major departure from his first two works about children and is critical of the treatment of women under Iran's Islamist regime.
Panahi has stated that "I started my career making children’s films, and while doing that I had no problems with censors.
As soon as I started making feature films, it all started and I had problems," but that "in my first films, I worked with children and young people, but I began to think of the limitations facing these girls once they grow up.
In order to visualize these limitations and to have this constraint better projected visually, I went to a social class, which has more limitations to areas that are more underprivileged, so that this idea could come out ever stronger."
He had to wait an entire year to get an official shooting permit, and the film was withdrawn by Iranian authorities from the Fajr International Film Festival for being "offensive to Muslim women" and was banned in Iran.
The film was shot in 35 days over a 53-day period.
As usual Panahi used non-professional actors, with the exceptions of Fatemeh Naghavi and Fereshteh Sadre Orafaiy.
He saw the lead actress, Nargess Mamizadeh, in a park one day and immediately offered her the role.
The film opens with one long, handheld shot that lasts over three minutes and took 13 attempts to achieve.
Panahi adopted a different camera style to depicit each of the four main protagonists' lives.
For the first, an idealistic woman he used a handheld camera.
For the second woman, the camera is mounted on a constantly moving dolly.
The third woman's story is told at night in darker outside outside, and the camera is static with pans and tight close ups.
For the last, least optimistic woman both the camera and the woman are completely immobile and very little sound is used.
Panahi won the Golden Lion, the top prize at the Venice Film Festival for "The Circle", and also won the FIPRESCI prize, the UNICEF prize, the Ecumenical Special Mention, the Sergio Trazzati Award; Mamizadeh won the Italian Film Journalist's Award for Best Actress at Venice.
The film went on to win the FIPRESCI Film of the Year Award at the San Sebastián International Film Festival, appeared on Top 10 lists of critics worldwide and won the Best Film Award at the Montevideo International Film Festival and the Freedom of Expression Award from the National Board of Review.