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  7 Passive Income Systems You Can Build Without Quitting Your Job Discover 7 powerful passive income systems built around high-value skills, premium digital assets, and long-term monetization strategies that work even while you sleep. 1. Licensing Digital Products for Recurring RevenueOne of the most scalable passive income systems involves creating license-based digital products. Instead of selling one-off eBooks or PDFs, you can license templates, design pac.. Economy 2025. 4. 10.