Compliance by Design

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Why this term?

Compliance by Design extends to AI the ex-ante, built-in approach that Privacy by Design (GDPR Art. 25) introduced for personal data and that Security by Design (ENISA, NIST SSDF) standardised for cybersecurity. Policy is the input contract of the training run, not a post-hoc checklist.

Compliance by Design is the design philosophy. Compliance-as-Code is the technique that delivers it (executable OSCAL policy, decorators, deterministic enforcement). AI Assurance is the deliverable the regulator audits (Assessment Results, Annex IV technical documentation, evidence bundle).

Compliance by Design (the why)
    ↓ enabled by
Compliance-as-Code (the how)
    ↓ producing
AI Assurance (the deliverable)

Three patterns in the SDK

1. Decorator-driven enforcement

vl.enforce(metrics, policy=…) runs inside the training script, not as a downstream audit. A control violation with severity=block halts the run before the model is registered:

import venturalitica as vl

with vl.monitor(name="Loan Default Audit"):
    metrics = pipeline.run(X_train, y_train)

vl.enforce(metrics, policy="assessment_plan.oscal.yaml", strict=True)

Compliance is a function call, not a JIRA ticket.

2. OSCAL-first input contract

vl pull retrieves the assessment_plan.oscal.yaml before training starts. The policy is the input contract of the run — the training script reads its compliance obligations the same way it reads its hyperparameter file:

vl pull                                    # fetches assessment-plan
python train.py                            # reads it as input

This inverts the traditional “model first, audit later” workflow.

3. Evidence as byproduct

vl.monitor() collects evidence (CycloneDX BOM, hardware fingerprint, file integrity, AST trace, carbon footprint) as the pipeline runs. On completion, the SDK materialises an OSCAL Assessment Results document, no separate audit pass needed. vl export-annex-iv derives the Art. 11 narrative from the same evidence:

vl export-annex-iv --agentic   # narrative for §1/2/3/5/8/9

The same run produces the model, the assurance evidence, and the regulator-facing documentation.

Regulatory lineage

Framework	Clause	What it asks for	How CbD answers
GDPR	Art. 25	Data protection by design and by default	Direct precedent — same ex-ante built-in approach
EU AI Act	Art. 9	Risk management throughout the lifecycle	Decorator-driven enforcement at training time
EU AI Act	Art. 15	Accuracy, robustness, cybersecurity by design	`enforce()` blocks deployment if thresholds fail
EU AI Act	Annex IV §3	Monitoring, functioning and control	`vl.monitor()` + Assessment Results
ISO/IEC 42001	A.6.2.4	AI impact assessment	OSCAL Assessment Plan before training
ISO/IEC 42001	A.8.2	Data quality	Probes + policy controls in the assessment-plan
ISO/IEC 42001	A.8.3	System lifecycle	Evidence collected per run, attached to model registry
NIST AI RMF	Govern 1.7	AI risks integrated into risk management	Compliance contract is the training input

Why this matters for v0.6.0

v0.6.0 unifies all OSCAL emission into a single assessment-plan envelope (see Migrating to v0.6 and the normative contract). That single envelope is what makes Compliance by Design tractable: one document in, one document out — both in the same OSCAL dialect, both auditable by vl-fairness-gate (Rust) and any other NIST OSCAL parser.