Никому не сообщать код.

not to disclose the code to anyone

Questions & Answers about Никому не сообщать код.

Why is никому used here instead of никто?

Because сообщать takes the person you tell in the dative case.

• никто = no one as a subject
• никому = to no one / to nobody

In this sentence, no one is not doing the action. Instead, the code must not be communicated to anyone, so Russian uses the dative:

• сообщать кому? = to tell whom?
• никому = to nobody

So:

• Никто не сообщает код = No one is telling the code
• Никому не сообщать код = Do not tell the code to anyone

Why is the sentence built with an infinitive, не сообщать, instead of an imperative like не сообщайте?

Russian often uses the infinitive for firm instructions, warnings, rules, and official notices.

So Никому не сообщать код sounds like:

• a written instruction
• a policy
• a warning
• something you might see on a screen, in a manual, or in a security message

Compare:

• Не сообщайте никому код. = Don’t tell anyone the code.
  More like a direct command to a person or group.

• Никому не сообщать код. = Do not disclose the code to anyone.
  More impersonal, formal, and instructional.

English does something similar in signs and instructions, like Do not enter or Not to be used.

Why is не used with никому? Doesn’t already mean ?