I'm making a video game with importable custom characters. My characters have a special license that forbids pornography and blasphemy in derivative works. It is viral in itself to prevent such acts.
However, if someone puts a ShareAlike character such as one from Club Penguin or Floraverse into my game, does it force my game to be licensed under ShareAlike? If so, then is it illegal to mix my viral license and ShareAlike?
In other words, are my characters doomed to never again be in a crossover with Floraverse characters or Club Penguin characters? Is there an exemption that I could ask from the Creative Commons license makers or the creator of Floraverse/Club Penguin?
A viral license is a license that forces all derivative works to be licensed under that same license.
A stained program is a program that has to be licensed under a viral license because it is "stained" by the content licensed by the viral license.