I think the Stalker Video Add On and all of its clones will not work anymore when the changes occur. Let me explain. The way the freeloaders can get access to NPFS is :
1. cloning the video addon, hardcoding the MAC Address, serial number to the cloned addon (that's why they're not giving the donation number)
2. using the python code of the VideoAddOn into a PHP code that authenticate to NFPS thus getting the channels. They do this in a channel by channel basis.
In the Stalker PVR Client, all code is embed in pvr.stalker.dll which is a compiled dll where you don't have the means to see any code. You can then implement a very good username/password algorithm, with hash 256, md5, encryption, whatever you want to do which will be make it imposible to recreate.
hmmm...why not goto the git and view the source code?
a simple search will get you there.