Ok guys thanks for your replies.
How i got the disc? i've borrowed the disc from a friend who is working in that business (hardware store with several PCs. I guess there are more than 30 PCs in that business.
When i've borrowed the disc there was 3 of them and he gave me one.
It's like a backup copy, just discs with no case.
Neither it's Original or Pirate, i will not use it to make $$$, just for home use.
The owner of that hardware is a Prosecutor. so i think it's original and i think he wont use pirate os on his business.
Ok guys, nothing further to ask.