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Proprietary software is software with restrictions on using, copying and modifying as enforced by the proprietor. Restrictions on use, modification and copying is achieved by either legal or technical means and sometimes both. Technical means include releasing machine-readable binaries to users and withholding the human-readable source code. Legal means can involve software licensing, copyright, and patent law. Exclusive legal rights to software by a proprietor are not required for software to be proprietary, since public domain software and software under a permissive license can become proprietary software by distributing compiled versions of the program without offering the source code. Proprietary software's restrictions make it an antonym of free software. For free software, the same laws used by proprietary software are used to preserve the freedoms to use, copy and modify the software.[1] Proprietary software includes freeware and shareware. It can be commercial software, but public domain and all other free software can also be sold for a price and be used for commercial purposes.