Editing PDMS/Requirements (section)

=== 5.2 Security Requirements ===

===== Data Security =====
* The system MUST:
** Implement basic data encryption
** Support secure channels
** Provide basic access control
** Implement basic key management

* The system SHOULD:
** Support advanced encryption
** Implement end-to-end encryption
** Provide fine-grained control
** Support key rotation

===== Privacy Protection =====
* The system MUST:
** Support basic anonymization
** Implement basic query privacy
** Protect basic metadata
** Provide basic network privacy

* The system SHOULD:
** Implement advanced techniques
** Support private retrieval
** Provide metadata obfuscation
** Enable privacy-preserving analytics

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