Share (P2P)
"Share" uses encryption to hide the identity of who is transferring or what they are transferring. It is non-centralized so it cannot be easily shut down and it supports multiple source "swarm" downloading. All files are transferred encrypted so they must be decrypted upon download completion. In the meantime they are stored in encrypted form in a "Cache" folder. This folder is also used to allow recently downloaded files to be shared among the network based on priorities.
Encryption software
Data in transit is data that is being sent over a computer network. 
When the data is between two endpoints, any confidential information may be vulnerable. 
The payload (confidential information) can be encrypted to secure its confidentiality, as well as its integrity and validity.