The actual and literal meaning of slok "Dharmo Rakshati Rakshitah" is "Religion(Dharma) protects those who protect dharma". The complete slok is mentioned below:
Dharm-Eva Hato Hanti, Dharmo Rakshati Rakshitah!
Tasma-Dharmo Na Hantvyo, Ma No Dharmo HatoVadhit!!
Dharm-Eva Hato Hanti, Dharmo Rakshati Rakshitah!
Tasma-Dharmo Na Hantvyo, Ma No Dharmo HatoVadhit!!