Link: https://www.draftkings.com/help/rules/1/
Discovery method: Direct lookup on the DraftKings help center.
Annotation:
Summary: This page defines contest level rules such as entry limits, contest formats, and general restrictions that shape how NFL contests run.
Credibility: It is an official primary source from DraftKings, so it sets the real constraints.
Use in my project: I use it to justify structural choices, including why max entry strategy matters and why duplication and payout structure create game theory pressure.
Limitations: This is rules language, so it does not teach strategy or explain how often specific builds win.