規約 and 規定: Terms, rules, and specified provisions
Compare reading terms before registration with preparing equipment under tournament regulations. Read the content and target of the rules without imposing a legal hierarchy.
Group rules and terms of use
規約 means rules or terms of use. 「会員は総会で新しい規約を承認した。」 reports members approving new rules at a general meeting. The rules are the object of approval.
「登録する前に利用規約を最後まで読んだ。」 describes reading the terms of use to the end before registering. Here, 登録 refers to registration, which is not restricted to membership enrollment.
Specified regulations or provisions
規定 means a regulation or provision. 「大会の規定に従って道具を準備した。」 describes preparing equipment in accordance with tournament regulations. The regulations guide the preparation.
「新しい規定は来月から適用される。」 says a new regulation will apply starting next month. Its stated start is future, rather than an already ongoing application.
Read the content and its target
The 規約 read before registration concerns use of a service. The 規定 followed in preparing equipment concerns the tournament. Reading, approval, preparation, and application are separate actions.
The two expressions can overlap in their meanings. Their names alone do not establish a legal hierarchy or the effects of a violation; the sentences identify the relevant content and actions.
What is read before registration under 規約, and what is followed in preparing equipment under 規定?
Show the answer and why
The first concerns reading terms of use, while the second concerns following tournament regulations in preparing equipment. Identify the rules’ content and the action connected with it.

