This looks like Fountain codes: http://en.wikipedia.org/wiki/Fountain_code http://en.wikipedia.org/wiki/Fountain_code Basically, you split your data into block

This looks like Fountain codes: http://en.wikipedia.org/wiki/Fountain_code http://en.wikipedia.org/wiki/Fountain_code Basically, you split your data into blocks, XOR random blocks together and the client can recreate the data by solving the equation of which blocks where XORed with which. A good tutorial is here: http://blog.notdot.net/2012/01/Damn-Cool-Algorithms-Fountain-Codes http://blog.notdot.net/2012/01/Damn-Cool-Algorithms-Fountain... And a fast implementation: http://en.wikipedia.org/wiki/Raptor_code http://en.wikipedia.org/wiki/Raptor_code