The case Shreya Singhal v. Union of India is related to which legal issue?

In Shreya Singhal v. Union of India (2015), the Supreme Court struck down section 66A of the IT Act as violating the freedom of speech under Article 19(1)(a), and read down section 79 and the related rules on intermediary liability. It was a challenge on free speech, not a copyright, trade mark or privacy case.