the "blind" person is the person (legal or moral) whose data are requested by subpoena - as far as that person is concerned, it's a "secret" request.

Blind Subpoenas and attorney-client privilege
Blind subpoenas served by a law enforcement agency or other entity requires the SaaS provider to turn data over to the authorities without notifying the data owner. All SaaS providers, including Microsoft, Salesforce, Google, Box, DropBox and others, state that they will comply as required by law. So your data – and your client’s data – could be made available and read without your knowledge or consent.

http://vaultive.com/wp-content/uploads/2015/07/Vaultive_blin...


Finally, government authorities can subpoena access to stored data at the cloud provider without the knowledge of the enterprise customer – a so-called “blind subpoena” – whereas if data is stored at the customer premises, the government would have to subpoena the enterprise directly, revealing to them that some kind of investigation was going on.

http://myperfectstartup.com/2011/05/05/security-in-the-enter...

2. What kind and level of data security is provided in an on-premises private cloud?
First of all, a big advantage of using an on-premises private cloud is that you continue to use your own firewalls, giving your staff the benefit of a tried-and-true first line of security that they are intimately familiar with. Of course, you’ll need strong encryption capabilities, but keep in mind the importance of deciding where those encryption keys are stored — ideally with your own IT organization. Consider the blind-subpoena scenario: If your cloud service provider is subpoenaed to give law enforcement agencies access to your data, you don’t want your service provider to have the encryption keys. Above all else, you’ll want your cloud partner to deploy a multilayered security architecture to ensure that mobile devices and other ubiquitous endpoints are protected against identity theft, malware, intrusions and many other security threats.

http://www.code42.com/resources/white-papers/private-cloud-c...

Finally, there's all those counterterrorism-related National Security Letters and the issue of the "blind subpoena", or the short-circuiting of the traditional legal discovery process that storing corporate data in a datacenter allows. The blind subpoena problem seems to be theoretical at this point. Still, if your customer data is encrypted and law enforcement wants the data, they'll have to ask your customer's lawyers for it like they did in the old days.

https://rcpmag.com/articles/2014/12/01/the-case-for-bringing...


SAISIES

Saisie de papiers, documents, données informatiques ou autres objets.
Si la nature du crime est telle que la preuve en puisse être acquise par la saisie des papiers, documents, données informatiques ou autres objets en la possession des personnes qui paraissent avoir participé au crime ou détenir des pièces, informations ou objets relatifs aux faits incriminés, l'officier de police judiciaire se transporte sans désemparer au domicile de ces derniers pour y procéder à une perquisition dont il dresse procès-verbal.

http://www.legavox.fr/blog/fabrice-r-luciani/perquisitions-r...

https://fr.wikipedia.org/wiki/Réquisition_judiciaire