public domain
noun /ˌpʌblɪk dəˈmeɪn/,  /ˌpʌblɪk dəʊˈmeɪn/
  /ˌpʌblɪk dəʊˈmeɪn/
[singular]- something that is in the public domain is available for everyone to use or to discuss and is not secret
- The information has been placed in the public domain.
 - public domain software
 - Sensitive information should not be released into the public domain.