A Tool is a computation function that transforms data within the PDA into new data. Privacy is inbuilt and ownership is assigned to the PDA owner. These functions create new data, from simple summaries to new insights, and deposit the data back into the PDA, privately for the PDA owner and yet fully shareable with their permission.
Data scientists can create new insights and data within the PDA for the PDA owner to share with an application, receiving royalties in return, and in turn making even the simplest application into a powerful, personalised service for the user. Tools provide better insights, are fully private and full shareable.