For most it follows the standard stuff:
- Don't sue me
- Derivatives must follow this license too (and be open)
- Commercial use allowed
- State changes and disclose source
- Distribution, modification, private use, etc. etc.
BUT if your legal entity meets certain conditions, say... being a multi-million dollar company, you are required to make a minimum contribution, code or monetary, to the developers.
You may wonder "what about forks?" - thats where the name comes in. If the legal entity pays a fork, some percentage of that goes up, and so on, until they get to the root project.
This license is licensed under itself. All works using this license must follow this license's license.