Deciphering Digital Rights Management

Maine cyber law mein padha hai, lekin yeh do concepts toh mujhe bahut confused karte hain - Digital Rights Management (DRM) aur Digital Rights Copyright Management System (DACMS). Dono doosre se judi hui nazar aate hain, kya fark hai yeh main samajh nahi pa raha. Kya yeh ek hi cheez hai, do naye naam se liye gaya hai? Ya phir yeh do alag-alag cheezein hain jo ek dusre se judi hain?

Main aap logon se aasha karta hoon ki aap mujhe yeh concept explain karke yeh clear karein ki kya aur kaise difference hai.