A leading figure in Egypt's 2011 revolution was handed 15 years in prison on Wednesday after a retrial, a judicial source told AFP.
But the court of cassation overturned the ruling in October 2017 and ordered a retrial, which concluded on Wednesday.
In addition to the 15-year jail term, Douma was fined six million Egyptian pounds, a judicial source said.
The verdict can be appealed.
While numerous key activists from the revolution are behind bars, the majority of top figures from Mubarak's regime have gradually been acquitted and freed.
The 2011 revolt saw hundreds of thousands of protesters call for "bread, freedom and social justice" and rally against a regime seen as corrupt and dictatorial.
Egyptian authorities systematically deny allegations of human rights abuses.
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