This document discusses cyber law offenses and sections of the Indian IT Act 2000 related to cyber crimes. It provides summaries of sections 43, 65, 66, and 67 of the Act which deal with unauthorized computer access, tampering with computer source documents, hacking computer systems, and publishing obscene content online respectively. Case studies are also summarized for each section to illustrate how the courts have interpreted and applied the laws. The key cyber offenses covered include hacking, software tampering, and distributing obscene digital content without permission.