If you want to make any sort of terms and conditions applicable to becoming a member of your Drupal site, I would suggest using the Legal module. It provides for a text agreement that a user must agree to to get an account on the site. The agreement is signified via a single checkbox or multiple custom checkboxes. Additionally, the terms can be updated which requires users to agree to the agreement during their next site visit, a text box also provides for notes on changes.

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