License for Discovery studio visulaizer?

Hi all, I am a graduate student of New Biology at DGIST, Korea. Now I used this BIOVIA Discovery Studio Visualizer for checking 2D ligand-receptor interaction, and I tried to use that information to publish. 
However, I was confused that where is the license for this software... 
Is this software free to use for the free version? Or do I have to purchase the license to publish? Please let me know...