Overview#
Evidence that is deleted too early can collapse a prosecution. Evidence held past its disposal date creates privacy liability. Between those two failure modes sits a complex matrix of jurisdictional rules, legal hold obligations, and storage cost pressures that no manual process reliably handles at scale. The Media Compliance and Retention module automates this lifecycle, applying the correct policy to every piece of evidence from the moment it enters the system through to authorised disposal.
Law enforcement agencies, defence organisations, and intelligence units all face distinct regulatory frameworks. This module supports all of them from a single policy engine, with multi-jurisdiction rule sets that can coexist within the same deployment.
Key Features#
- Automated retention policy enforcement based on evidence type, category, and jurisdiction
- Legal hold management preventing disposal of any evidence under active litigation or investigation
- Tiered storage lifecycle moving evidence between hot, warm, and cold tiers on Cloudflare R2 as access patterns change
- Compliance validation against regulatory requirements and organisational policies
- Scheduled disposal workflows with multi-level approval gates and full audit documentation
- Multi-jurisdiction policy support for organisations operating across regulatory boundaries
- Retention reporting and compliance dashboard for real-time status monitoring
- Policy exception management with documented justification tracking for every deviation
Use Cases#
- Enforcing jurisdiction-specific media retention policies automatically across evidence collections without manual intervention
- Managing legal holds to prevent accidental disposal during active litigation or concurrent investigations
- Moving ageing evidence to cost-effective cold storage tiers while maintaining defined access response times
- Generating compliance reports demonstrating adherence to regulatory retention mandates for auditors and oversight bodies
- Tracking policy exceptions with documented justification chains for accountability
Integration#
The module connects with evidence management, legal hold systems, storage management, and compliance reporting. All disposal events and hold actions write to the audit trail with full attribution, supporting European Defence Fund and PESCO compliance requirements for data lifecycle governance.
Open Standards#
- GDPR (EU Regulation 2016/679): The retention engine enforces Article 5 storage limitation and Article 17 right to erasure by scheduling automated anonymisation and hard-deletion sweeps keyed to per-field retention classes, while legal holds prevent any disposal that would prejudice data subjects' rights.
- EU Law Enforcement Directive (LED, Directive 2016/680): The compliance framework registry explicitly maps this directive as a first-class policy target alongside GDPR, governing lawful processing and lifecycle obligations for evidence held by law enforcement agencies.
- CJIS Security Policy: Automated compliance validation assesses chain-of-custody tracking, audit-log completeness, FIPS 140-2 cipher usage, and retention period adequacy against CJIS section controls (5.4.1, 5.4.2, 5.11.1) required for criminal justice information.
- ISO/IEC 27037:2012 (Digital Evidence): The legal compliance validator explicitly checks evidence collection, acquisition, preservation, and presentation procedures against this standard, recording pass/fail against each ISO 27037 control category.
- W3C Verifiable Credentials Data Model v2.0: Every evidence item and chain-of-custody transfer is anchored by an Ed25519-signed Verifiable Credential issued under a DID, giving disposal approvals and hold actions a cryptographically verifiable provenance record.
- OASIS XACML 3.0: Disposal approval gates and retention access-control decisions are evaluated by a Python implementation of the XACML 3.0 policy model (deny-overrides combining algorithm), with attribute categories drawn from the OASIS URN namespace.
- AWS S3 API (S3-compatible object storage): The tiered storage lifecycle transitions evidence between hot, warm, and cold tiers on S3-compatible object storage via the boto3 client and presigned URLs, applying time-to-live policies that map to the platform retention classes.
- OWASP ASVS v4 (V8.3.8): The automated retention purge service is directly referenced against ASVS V8.3.8 (L2/L3), which mandates scheduled deletion or anonymisation of sensitive personal data past its retention threshold, with a legal-hold fence to prevent premature disposal.
Last Reviewed: 2026-02-05 Last Updated: 2026-04-14