---
title: Explanation overview
---

* [How to comply with the "altered versions" clause of the
  license][FAQ_ALTERED_VERSIONS]
* [What are "interchangable passphrases" in `vault`, and what does that mean
  in practice?][FAQ_INTERCHANGABLE_PASSPHRASES]
* [Tradeoffs between a master passphrase and a master SSH
  key][TRADEOFFS_PASSPHRASE_SSH_KEY]
* [Should I use one master SSH key/master passphrase, or many?][MANY_MASTER_SECRETS]

[FAQ_ALTERED_VERSIONS]: faq-altered-versions.md
[FAQ_INTERCHANGABLE_PASSPHRASES]: faq-vault-interchangable-passphrases.md
[TRADEOFFS_PASSPHRASE_SSH_KEY]: tradeoffs-passphrase-ssh-key.md
[MANY_MASTER_SECRETS]: many-master-secrets.md