I am Bart from the Netherlands.
Straight to the point, I bought one Emsisoft Anti-Malware licence key for two computers for my neighbour.
And I saw at my home computer where I have Emsisoft Anti-Malware, that it is possible to get more days if you buy Emsisoft Anti-Malware for other computers/people. ( Source: https://www.emsisoft.com/en/partner/referral/?id=12286066 )
So what I did, I downloaded it from my home computer and put it on an extern harddisk. I went to my neighbour and installed Emsisoft Anti-Malware on both of his computers. After that, I added the licence keys.
It works great both on his Computers. When I came home I saw that my licence keys did not get the extra days.
Sorry for my English, I hope you understand the text