Duda told reporters he had decided to veto the controversial bill due to many protests and requests from various groups across the political spectrum to block these regulations.
"I have received a total of 133 letters of protest," he said, as quoted by state news agency PAP.
"Some of these were signed by dozens of social organizations," he added.
"It is clear that this proposal failed to gain wide acceptance ... We don't need new tensions in Poland today," Duda also said, referring to Russia's war in neighbouring Ukraine.
Duda, who is otherwise an ally of Poland's conservative government, vetoed a previous version of the same bill, sponsored by Education Minister Przemysław Czarnek, earlier this year.
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Source: IAR, PAP