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Netpbm consists of code contributed by many authors. In most of the source code files, there is a copyright notice and license, telling you what you may or may not do with the code. All authors have granted you the right to use and distribute their code without having to pay them, as long as you meet some simple requirements. Most of the components require you to include a copy of their copyright notices and warranty disclaimers in any copies or derivations you distribute. Another restriction that some of the software has is that in order to have permission to copy it (which includes writing anything derived from it), you must distribute source code for your copy or derivation and propagate the same restriction to people who would copy your derivation. In other words, the price the author wants for the use of his proprietary work is your contribution to the free software cause. One component prohibits you from selling it or using it in a commercial way: hpcdtoppm. Some components are contributed to the public domain. The copyrights on individual components of this package are detailed at appropriate places within the package. A slightly out of date summary of all the copyrights is in the file 'doc/copyright_summary' in the Netpbm source tree. Each component is a package of code and documentation; e.g. the 'pamcomp' program and the pamcomp user manual go together and are licensed to the public as a package. The Netpbm manual is just a hyperlinked collection of such component manuals. Parts of the manual that are not tied to a particular component of code and do not carry a copyright notice are in the public domain. As with most public open source software, no one really knows for sure where the code came from. It is possible that a contributor copied it without license to do so. That might mean any user of the code owes someone royalties. The Netpbm maintainer in particular has received no warranties regarding any of the code in the package. So consider all the above to be modified by "to the best of the Netpbm maintainer's knowledge." Netpbm may practice valid patents, which would mean that you owe someone royalties if you use the code. This is a minuscule risk, though. What is known about patents related to Netpbm is in the file 'doc/patent_summary' in the Netpbm source tree.