The software that runs this site is free. It is released under an MIT (X11) license. You can download the source code and the database, alter it, improve it or otherwise do whatever you like with it. If you'd like to help improve NutriDB, then feel free to send patches or other improvements.
NutriDB, like pretty much every other nutrition calculator in the world, uses data from the U.S. Department of Agriculture, Agricultural Research Service. NutriDB currently uses USDA National Nutrient Database for Standard Reference, Release 28.
NutriDB also calculates the percentage of the Dietary Reference Intake (DRI) for nutrients for which a DRI exists. The DRIs have replaced the RDA (Recommended Daily Allowance), for people more familiar with the acronym RDA.
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