Hi guys! I will explain my question.
I have already checked that some of the servers has set up a security for their mission pbo archives.
For example when I go to C:\Users\x\AppData\Local\ArmA 2 OA >> I can see missions from other server.
When I try to open my own server mission with a PBO manager, it simple opens >> everything okey.
But when I try to open some other servers PBO archive, for example this server >> https://www.gametracker.com/server_info/91.134.167.228:2302/ . I get a error (attachment).
I do not want to steal their shi#, I`m simple asking this because I also want to secure my own server in that way.