利用規約をよくお読みください。
Please read the terms of use carefully.
このクラブには厳しい規約がある。
This club has strict rules.
That action violates the terms of use.
You need to agree to the terms before registering.
Members must abide by the rules.
The company revised its terms of use.
The new organization established its bylaws.
規約 refers to the overall set of rules or bylaws of an organization, while 約款 refers to individual clauses within a contract, often prepared unilaterally by a business.
規約 usually refers to a formal set of bylaws agreed upon by members (e.g. a club's constitution), whereas 内規 is more often an organization's own internal administrative rules, not necessarily agreed to by all members.
規約 is a formal set of written rules or terms (as in a contract or organization's bylaws), while ルール is the general, casual term for any rule.
規約 refers to the internal rules or bylaws of an organization, while 憲章 is a more formal, often symbolic founding document.
protocol
head feature convention; HFC