IPFS is a peer-to-peer distributed file system that seeks to connect all computing devices with the same system of files. In some ways, IPFS is similar to the Web, but IPFS could be seen as a single BitTorrent swarm, exchanging objects within one Git repository. In other words, IPFS provides a high throughput content-addressed block storage model, with content-addressed hyperlinks. This forms a generalized Merkle DAG, a data structure upon which one can build versioned file systems, blockchains, and even a Permanent Web. IPFS combines a distributed hashtable, an incentivized block exchange, and a self-certifying namespace. IPFS has no single point of failure, and nodes do not need to trust each other.

YTFS - File system which enables you to search and play movies from YouTube as files - with tools of your choice.

Throughout our life, we all continue to generate content, whether that's writing documents, taking photos, writing comments online, liking our friends' posts on social networks, etc. Our content is typically spread between a mix of different companies' servers ("The Cloud") and your own hardware (laptops, phones, etc). All of these things are prone to failure: companies go out of business, change ownership, or kill products. Personal harddrives fail, laptops and phones are dropped.

It would be nice if we were a bit more in control. At least, it would be nice if we had a reliable backup of all our content. Once we have all our content, it's then nice to search it, view it, and directly serve it or share it out to others (public or with select ACLs), regardless of the original host's policies.

Camlistore is a system to do all that.

Chattr permet de sécuriser un fichier ou un répertoire en rendant leur suppression impossible, même avec les droits root.
Chattr est installé par défaut dans les distributions GNU/Linux.

Pour sécuriser un fichier :

sudo chattr +i fichier

Pour supprimer l’attribut i :

sudo chattr -i fichier
Pour sécuriser un répertoire :

sudo chattr +i -R répertoire

Et pour annuler cette action :

sudo chattr -i -R répertoire

voir aussi : http://linux-attitude.fr/post/gestion-des-attributs-d-un-fichier