What type of information is considered to be in the public domain?

Information published in a book available through bookstores and libraries is considered to be in the public domain because it is accessible to the general public without any restrictions. When a work is published and made available through these channels, it can be freely used, shared, and cited by anyone, as long as proper attribution is given when required. This accessibility enables the dissemination of knowledge and ideas, contributing to public discourse and education.

In contrast, classified military reports and confidential government documents are protected and not meant for public distribution, as they contain sensitive information critical to national security or operational integrity. Trade secrets are proprietary information that businesses use to maintain a competitive edge and are protected by law to keep them from being disclosed to competitors or the public. Therefore, the only option that truly reflects information that is freely available to anyone is the published material found in bookstores and libraries.