FormerlyDickensC said:I have a friend in law school
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The 4E rules are governed by copyright. They are not patentable
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Therefore, unless the 4E rules are actually patented, then I see no legal action that can be taken against anyone for creating a software app that inherently uses those rules without re-publishing them.
I teach in a law school (in Australia, not the US) but not in IP. Nevertheless, I'll give you some thoughts.FormerlyDickensC said:After thinking about it, I would guess that you could not use trademarked names/proper-nouns in the software application (names of monsters, races, powers, etc). But I'm pretty sure that as long as the names are not trademarked, then their use does not otherwise constitute a copyright violation if used in isolation.
How the app handled descriptive text (names and other identifiers) would seem to be the biggest issue.
In the second quoted paragraph you don't take your thought quite far enough: as Robertsconley pointed out above, the issue would as much be the extent to which that text breached copyright as opposed to simply wrongly used WoTC's trademarks.
Furthermore, I don't know that it's true that the 4e rules can't be patented although, as far as I know, they have not been.
But in any event, it seems possible that one might design an application that could run a 4e game (though even then the code might potentially be derivative of WoTC's copyrighted text - I don't know enough about either coding or the US law of derivative works) but be extremely constrained in the permissible textual output that it might give: character sheets, power descriptions, monster statblocks etc would all at least potentially be in breach of WoTC's copyright.