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@Mikhail Ryazanov: Please explain why did you rename this category from "Public domain software with source code" to "Public-domain software with source code"? There is no hyphen in the term "public domain". -- intgr[talk] 09:51, 9 March 2016 (UTC)[reply]
There is no hyphen in the term "public domain" itself, but here it is used as a compound modifier and therefore must be hyphenated. Otherwise "public domain software" would mean "domain software that is public", where "domain software" might be, for example, software for domain controllers. — Mikhail Ryazanov (talk) 11:08, 9 March 2016 (UTC)[reply]