One man, Nguyen Thi Duc, was given a reduced sentence of one year; two others were given reduced sentences of 25 days.
Development experts say Monday’s meeting is a positive step following seven months of political infighting between the Rescue Party and the ruling Cambodian People’s Party.
Prime Minister Hun Sen has ordered Phnom Penh authorities to grant permission to both sides of demonstrations to occupy Freedom Park in the capital.
Prince Ranariddh’s Funcinpec won the 1993 elections but were forced into a power-sharing agreement with the Cambodian People’s Party, led by Hun Sen.
Prince Norodom Ranarridh, once Prime Minister Hun Sen’s biggest political rival, has formed a new party.
Officials say that each party will have six representatives on the commission, but no date has been set for a first meeting.
Prince Ranariddh said Monday he believes a new party is needed to help solve the country’s biggest issues, such as poverty, low wages for laborers and civil servants, corruption and the destruction of natural resources.
Rescue Party President Sam Rainsy said Thursday negations cannot take place “at gun point.”
Rescue Party President Sam Rainsy told supporters via Facebook on Wednesday the Rescue Party will continue to call for an investigation, as well as a recall election.
Only about 5 percent of local elected officials are below the age of 30, according to statistics from the Khmer Institute for National Development.
The talks marked the most progress in negotiations between the two sides since similar meetings in September 2013.
Cambodia’s ruling and opposition parties reopened negotiations on Tuesday, seeking to end a political deadlock that has been in place since July’s national elections.