Right to Privacy a Fundamental Right, Says Indian Supreme Court

It's really not, though, it's just a convenience; one could easily find grounds tomreverse Roe.and even the subsequent abortion decisions without just ignoring the Ninth Amendment. The real reason is that the Ninth Amendment is irreconcilable with the narrow mode of textualism that I personally think of as “four corners” or “sola scriptura” textualism, that seems to portray the Constitution’s text as complete and needing no external historical, cultural, etc., understanding to interpret. Because the Ninth Amendment specifically lays out that their are rights which existed and remain protected wothout being enumerated in the Constitution, it necessitates looking beyond the four corners of the Constitution to identify what those rights are.

  "... the State can impose reasonable restrictions in the
  interests of the sovereignty and integrity of India, the
  security of the State, friendly relations with foreign
  States, public order, decency or morality or in relation 
  to contempt of court, defamation or incitement to an
  offence."

Because people sometimes tend to equate "fundamental" with "absolute", and assume that the right cannot be taken away from them under any circumstances. That is not correct.

> You didn't mention what type of restrictions can be put

What is a "reasonable restriction" has not been defined unequivocally - it is subject to interpretation of the courts.

So before this judgment, the legislature could have for example made a law requiring all internet activity to be reported to the government or criminalized homosexuality (existing law) and anyone challenging the law could not claim that the law violated his privacy as such a right was not recognized.

After this judgment, such an argument could be made and the courts would test whether the violation of one's privacy is a reasonable restriction or not. So a law requiring you to have number plates on your car to be captured by traffic cams, or KYC norms for Bank accounts, reporting of your financial data to tax authorities could be held to be a reasonable restriction whereas laws such as criminalizing one's sexual orientation could be held unreasonable.

What prompted this constitutional reference was the governments 'Aadhar Scheme' which compelled 1.2 billion citizens to hand over their private biometric data to the government if they wanted to claim any government services. This judgment provides the test to be used while deciding whether the law and its applications are constitutional. Most likely the scheme will not be struck down in total but specific instances will be tested on a case by case basis. (eg. Aadhar can't me made compulsory for getting health services but can be made so for a Gun Licence as the latter seems reasonable but the former may not)