2. Free or Open Source? The term “open source” software is used by some people to mean more or less the same category as free software. It is not exactly the same class of software: they accept some licenses that we consider too restrictive, and there are free software licenses they have not accepted. However, the differences in extension of the category are small: nearly all free software is open source, and nearly all open source software is free. — Free Software Foundation
11. 10 Commandments of Open Source 1. Free Redistribution 2. Source Code 3. Derived Works 4. Integrity of the Author's Source Code 5. No Discrimination against Persons or Groups 6. No Discrimination Against Fields of Endeavor 7. Distribution of License 8. License Must Not Be Specific to a Product 9. License Must Not Restrict Other Software 10. License Must Be Technology Neutral