Skade
Explorer
I have a similar problem. For a very long time it as "understood" that the characters used in my games were my property if it ever came to publishing. This was mostly because Hickman and Wies obviously owned all the characters that were used in their games.
Other than that, the players could do whatever they wanted with them. Sounds funny I know. This is just a strange concept, but when I first found out that characters made for one of my games were being used in another game, it actually hurt my feelings. Particularly because the characters were now evil. Mechanically the same, just evil. Why not just change the name? Anyway, I have come to the conclusion that now all characters non mechanical parts should remain in the game for which they were created. Anyone can use the stats, but the concept and the name should just be forgotten outside of that campaign. The only exception being if the player wants them to be used.
Other than that, the players could do whatever they wanted with them. Sounds funny I know. This is just a strange concept, but when I first found out that characters made for one of my games were being used in another game, it actually hurt my feelings. Particularly because the characters were now evil. Mechanically the same, just evil. Why not just change the name? Anyway, I have come to the conclusion that now all characters non mechanical parts should remain in the game for which they were created. Anyone can use the stats, but the concept and the name should just be forgotten outside of that campaign. The only exception being if the player wants them to be used.