The Charter of Citizens' Rights, released last month by the office of President Hassan Rouhani, embodies freedoms including the right to trial in open court without arbitrary detention.
But Elham Aminzadeh, special assistant to Rouhani on citizens' rights, told AFP in an interview that the bill has no power over the judiciary or parliament and only covers the civil service and other parts of the executive.
"I cannot put an article in this charter for the judiciary or legislative," said Aminzadeh, who spent three years compiling the document.
On the trials of dual nationals, who have recently been jailed in closed-door courts, Aminzadeh said: "Security prisoners have a special process inside the judiciary. We cannot say anything about special security prisoners.
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"We talk to the judiciary, but just talk and notifying -- nothing more," she added.
Recent months have seen several cases such as that of British-Iranian Nazanin Zaghari-Ratcliffe, sentenced to five years in prison for "sedition", and US-Iranian Siamak Namazi and his father, both given 10 years for espionage, which have caused outrage around the world.
"In comparing to other countries, I think (the human rights situation in Iran) is good, but it can be better," she said.
Aminzadeh denied the charter was just an attempt to win votes ahead of Rouhani's likely bid for re-election in May. It had been a key campaign promise in 2013.
"It's not a slogan... It is not just for the Rouhani government, it is for the next 100 years," she said.
"I don't know why of the many different human rights violations around the world, the foreign media is not keen on discussing them," she said, highlighting the use of chemical weapons by Iraq in the 1980s.
She accused Human Rights Watch and Amnesty International of picking on Iran and ignoring rights abuses in countries like Bahrain and Yemen -- saying this was "double standards".
In the past five years, Human Rights Watch has written 14 long reports on Yemen and five on Bahrain, compared with four on Iran.
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