Copyright law governs the sale and distribution of "intellectual property" such as books, articles, musical compositions, and computer programs.
- copyright - compare patent, trademark
- copyright infringement
- derivative work
- end-user licenses
- open-source software, open-source licenses, open-source licensed software
- viral software, "viral nature", "copyleft"
- the General Public License, "free software" - Free Software Foundation
- proprietary software
- shrink-wrap contract
- reverse engineering