How can I ensure enriched data complies with privacy laws?

You've decided to enrich your subscriber data with a third-party service. Smart move in theory. But the moment someone else's data about your subscribers lands in your system, you've taken on a new set of legal responsibilities. Here's how to handle that without getting caught out.

1. Do your homework on the vendor first

Before you sign anything, ask the enrichment provider some direct questions. Where does their data come from? What consent did the original data subjects give? Does that consent actually cover sharing with third parties for marketing? A reputable vendor will have clear answers. If they're vague, that's your answer too.

Ask for their Data Processing Agreement (DPA), privacy policy, and any audit certifications they hold. If they can't produce these, walk away. You'll be the one explaining to regulators where the data came from.

2. Get the DPA right

Your DPA with the enrichment provider should cover a few non-negotiables. It needs warranties that their data collection was lawful. It should include indemnification if their data turns out to be non-compliant. It needs restrictions on how they process your subscriber data during the enrichment process itself. And it should give you audit rights so you can verify their practices if you ever need to.

If the provider is outside your jurisdiction (say, a US vendor and you're sending to EU subscribers), make sure the agreement covers cross-border transfer requirements too. The risks here are real, and they fall on you as the data controller, not just the vendor.

3. Update what you tell subscribers

Your privacy policy needs to disclose that you use third-party enrichment services and explain what types of data you pull in. If you haven't updated it since you started enriching data, that's a gap worth fixing today.

Depending on your legal basis for processing, you may also need to notify subscribers directly that you hold enriched data about them. Under GDPR Article 14, if you obtained data about someone from a source other than the person themselves, you generally have to tell them. That notification doesn't have to be dramatic. A clear line in your next email or a privacy update notice can cover it.

4. Give subscribers a way to see and correct the data

And if you've inferred that someone fits a particular demographic or behavioral category, they should be able to see that inference and correct it if it's wrong. Some senders go further and offer an opt-out specifically for enrichment, letting subscribers limit processing to only what they shared directly. That's good practice, and in some jurisdictions it's required.

5. Document everything

Keep records of which enrichment provider you used, when you started, what data fields you pulled, and the legal basis you relied on. If you're ever questioned, your documentation is what stands between you and a fine.

One honest note: privacy law varies by country, and the specifics of GDPR, CCPA, CASL, and others don't always line up neatly. If you're unsure which laws apply to your audience, it's worth talking to a qualified privacy lawyer before you scale up enrichment. This guide gives you the framework. A lawyer gives you the certainty.

If you're still figuring out what your data practices look like overall, our SOS hotline is free and we're happy to point you in the right direction.