Restricting folder access in Network.

Hi,

I have installed Kodibuntu in to a dedicated PC and connected it to my windows network. I use to copy & paste movies, songs etc to Media server from my PC. Now the problem is every one in my network is able to view edit or delete those files! I would like restrict the folder access to others through network. i.e A username & password to view & edit those folders in network. Kindly help…. Undecided