This document summarizes penalties and offenses under the IT Act 2000 in India with case studies. It discusses sections 43, 65, 66, 66A, 66C, 66D, 66E, 66F, 67, and 69 of the Act and associated cases. One case study describes a credit card fraud where victims' computers were infected to make unauthorized online transactions. Another case found an individual guilty under sections 66 and 420 of tampering with broadband internet accounts and hacking sites across cities. The document concludes with an example of web defacement where a government site was altered on a symbolic day.