周知

1. Origins, structure, and basic meaning

• Structure: 周知 (しゅうち) means publicizing information or its being widely known. 周知した is active dissemination; 周知されていなかった is an insufficient passive state.
• Basic usage: A schedule change is communicated to every participant, whereas a rule has not become sufficiently known among residents.

2. Common pitfalls and similar expressions

• Agent spreading information and state of inadequate awareness
  • The communicated content takes を, and the audience takes に. The negative passive does not mean the rule did not exist; it means awareness had not spread enough.