HELP Licence KEY needed

right now this is written on my header [rev_slider blog] 
and when I look inside my plugins they tell me that I have installed and activated Revolution slider. But it also tells me:  Activate Slider Revolution for Premium Benefits. You can Enter an existing licence key or Purchase a licence key.
Do I have to spend money on this? If I follow the instructions it tells me to spend 19 $ to get a license for this -.-

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