The use of
external materials is only permitted if the
terms / license under which they are released allows it, or it can be classified as
Fair Use.
- Any material created by Blizzard Entertainment can safely be used, as long as the target game is owned by Blizzard Entertainment.
- If they are released without terms / license, having permission from the author is preferred but not required, because the original author has full rights to have it removed.
- The Hive Workshop deems the usage of copyrighted material in maps Fair Use as long as the map does not take value away from the source (e.g. a game) and the usage is non-profitable.