Section 19(1)(c) ke paas kya hua...?

Maine socha tha ki Contract Act ke Article 19(1)(c) ke andar freedom of speech ke liye relaxation hoga, lekin phir kyon yeh condition hoti hai ke woh relaxation sirf koi activity hoti hai jo sabke liye useful ho? Kya yeh condition sabke liye applicable hoga? Maine ek case ki padhne ki koshish ki thi, M. P. Sharma vs Satish Chandra, lekin usme yeh Section ka explanation nahin diya gaya tha. Main samajh nahin paya ke kya yeh Section ke andar kya kya hai. Koi bhi student jo isme samajh nahi paya, meri help kare.