I took a look at the SHIV EULA. Here is an excerpt:
Quote:
It is not permitted:
- To modify the Multimedia Product or create any derived work
- To create or distribute any unauthorized levels and/or scenarios
- To decompile, reverse engineer, or disassemble the Multimedia Product
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I'm not a lawyer, but it looks like modding the game is technically against the license. Of course, they reserve the right to enforce or not enforce, so they encourage modding as long as it doesn't harm their business. But if someone tried to undercut them in some way they could enforce it.
Regarding the saved games, only a file generated by the game would actually be stored on the server - all the code and data that makes the game run is on your PC, both original and modded. It's likely that if a mod changes the format of the save file, it wouldn't be a problem, since they probably just store it as a blob of bits.
At any rate, the mods themselves aren't ever on the server.
Remember that with almost any piece of commerical software, you are just getting a license to use it, you don't own it.