Political activist Safwan Mohamed, who was recently detained in Alexandria over possession of a controversial sticker, was released on Monday, reported Al-Ahram's Arabic news website.
The activist's lawyer, Mohamed Hafez, told Ahram Arabic news website the prosecution decided to release Mohamed because there were no real charges against him.
A leading member at the liberal Constitution Party, Mohamed was arrested on Sunday at a checkpoint in eastern Alexandria after the police found a sticker on his laptop saying "No to military trials".
"Possessing a sticker that reads 'No to military trials' or chanting 'Down with the military' are not real charges, but rather demands that can be made by any citizen," Hafez added.
Safwan Mohamed was among the first Egyptians who signed a petition in 2010 supporting Nobel Laureate Mohamed ElBaradei's calls for reforms during ousted president Mubarak's rule.
In recent months, police have arrested scores of individuals on charges of displaying the pro-Muslim Brotherhood "Rabaa sign" in public. A number of liberal and leftist activists have also been arrested for protesting without state permission, according to a controversial protest law passed in November 2013.