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Some progs go online only to get some activation info then write it to registry or files.
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Yes, this is one kind of online-check : in this case, the real check is done by the prog itself, and the server is only needed to provide somme infos. So, it's often easy to emulate a false server's answerd by patching the prog.
But it's another story when the prog ask the server to do some real job, sending to him the local infos. Here, it's the server wich do the check, and if you don't give the right key, you remain off... That's the case of many trading softs witch needs to use fresh quotes for sample. Basically, it's like a simple ftp : without psw, no entry !
