A Paris court on Wednesday handed jail terms ranging from four years to life to more than a dozen people convicted of helping Islamist gunmen who attacked satirical weekly Charlie Hebdo and customers at a Jewish supermarket in January 2015.

Candles are lit up to commemorate victims of the terrorist attack against Charlie Hebdo in 2015 during a commemoration at the Place of the Republic in Paris, France, on January 7, 2016. (Photo: Xinhua)

Survivors and family members of the dead sat in silence as the verdicts were read out, which they hailed afterwards as a victory for justice and freedom of speech after a sometimes traumatic trial that revived the horror of the killings.

The editor of Charlie Hebdo Laurent "Riss" Sourisseau, who lives under round-the-clock police protection, was also in court to hear the sentencing by a five-member team of magistrates who had listened to evidence against the accused over three months.

"It's been painful, searing. It's been a stage in our mourning process, necessary and unavoidable," said a lawyer for Charlie Hebdo, Richard Malka. "I hope it's the start of something else, of an awareness, a wake up call."

In the absence of the attackers themselves - all three were killed by security forces in the days after their rampage - French investigators instead focused on accomplices to the men, including their weapon suppliers.

The main accused, Ali Riza Polat, was judged to have known about his friend Amedy Coulibaly's plans to take part in the attacks, and was given a 30-year sentence for complicity, which he immediately said he would appeal.

Another 10 accused were present in court, all men ranging from 29 to 68 years old with prior criminal records but no terror convictions. They were all found guilty on a range of charges.

In all, 13 sentences were handed down, including to two accused who were tried in absentia.