You may want to reserach the topic of "abandonware" -- google is a good place to start. One of my wife's friends is a big proponent of abandonware, and he could tell you the legal ins-and-outs of the system.
Personally, I choose not to use abandonware, as I believe that there is a large legal issue that remains unresolved. By the time SHIII becomes abandoned, though, there could be legal bulkheads in place to guide you in your search for gaming solutions. If I were you, I wouln't worry much about it until then.
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