Nmap License //free\\ Official

| Action | Allowed? | Requirement | | :--- | :--- | :--- | | | Yes | None. | | Redistribute official copies | Yes | Keep license file and copyright notice. | | Modify source & distribute | Yes | Must rename the software; must release source under GPLv2. | | Sell Nmap | Yes | You can sell copies (e.g., on a DVD), but you must provide the source code to the buyer. | | Embed code in closed app | No | Violates GPL unless you open-source your app. |

Nmap links with the for cryptography features (like version scanning over SSL). Historically, OpenSSL had a license (the Apache-style license) that was technically incompatible with the GPL (the "advertising clause" conflict). nmap license

The debate over the Nmap license continued for years, with some arguing that it was too permissive, while others claimed it was too restrictive. But Fyodor remained steadfast, convinced that the NPSL was the best way to protect Nmap and its users. | Action | Allowed

Years later, Nmap had become an industry-standard tool, used by millions of users around the world. And Fyodor's decision to uphold the NPSL had ensured that Nmap remained free, open-source, and available to anyone who needed it. | | Modify source & distribute | Yes