Class Notes on PG. Diploma Cyber Law – E-Commerce (SEM I) December 2, 2012 · Read time: < 1 min Class Notes on PG. Diploma Cyber Law – E-Commerce (SEM I) UNIT I Introduction to E-Commerce, Meaning and Definition History of E-Commerce Kinds of E-Commerce Advantages and Disadvantages of E-Commerce UNIT II Technical Issues in E-Commerce Online Advertisements and Trading Concepts of Cryptography, Encryption, Decryption Essentials of E-Commerce UNIT III Register for more!