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4.0.1 A client should provide the ability to save its message history, and provide a persistent view of that history across client restarts.
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4.0.2 Message persistence should be disabled by default.
- Clients may provide users with a setting to enable message persistence by default.
- If stored message logs are not encrypted, clients must make the user aware of this fact if they enable message persistence.
- If message persistence is enabled by default, all message logs stored on the device must be encrypted using the cryptography functions provided by the Tox API, or a comparably reputable, free and open source cryptography library.