A Strong Alternative to Feroot
Client-Side Security Without the Busywork
The quick takeaway
- Choose Feroot if you want a hands-on workflow centered on continuous monitoring and manual policy adjustments.
- Choose Source Defense if you want automated protection with enforceable control, including scalable policy enforcement, grouped data access control, patented sandboxing prevention, and research-backed coverage.
See what runtime protection looks like in a live demo.
Instant insight into script behavior, risk scoring, and PCI DSS compliance gaps.
Where Source Defense Pulls Ahead
Policies built from real-world script behavior
Modern websites change constantly, and they rarely stop at third parties. New scripts appear, existing scripts change, and third-party services routinely load additional scripts (fourth-party, fifth-party, and beyond). Risk expands without warning, and manual review turns into a never-ending cycle.
Source Defense is grounded in real-time monitoring of script behavior running live. That experience is used to automatically recommend and apply policies, so teams can keep strong protection in place without constant tuning and without breaking legitimate site functionality.
Script justification without the investigation
When scripts change and fourth- and fifth-party dependencies appear, it is not enough to know what is running. You also need to explain why it is there and what it is doing in terms a security, compliance, or business owner can stand behind.
Source Defense automatically categorizes scripts and can also generate script justifications using the same real-world intelligence accumulated over a decade of experience. The goal is simple: reduce time spent on manual reviews and stay audit-ready as the site evolves.
Data access control that matches business needs
You should not have to choose between “let the script work” and “protect sensitive data.”
Source Defense enforces grouped data access control at the policy level. Scripts can keep doing what the business needs (analytics, personalization, chat, A/B testing), while sensitive inputs, especially payment data, remain protected. This reduces operational overhead because policies do not depend on brittle, field-by-field manual definitions or constant rework each time scripts change.
Patented JavaScript sandboxing that prevents, not just observes
Visibility is helpful. Prevention is better.
One of the benefits of Source Defense Protect is that it uses a patented sandboxing approach designed to stop malicious script behavior in real time. By preventing scripts from running directly on the live page, it can block stealthy injection attempts, including “double-form” techniques that silently deface checkout pages to capture sensitive data.
Research-led protection that keeps pace with new attacks
Client-side attackers rotate domains, change delivery methods, and evolve fast. Defenses that do not continuously adapt fall behind.
Source Defense maintains a dedicated research team focused on client-side threats. Those findings feed protections so the platform stays ready for new techniques as they emerge. Explore the Source Defense Research blog
What To Expect In The First 30 Days
Source Defense uses a defined onboarding process that moves from discovery to full protection in less than a month.
You can expect:
- Automatic discovery and scoping of all scripts across your payment flows
- A custom PCI dashboard with live findings
- Recommended behavioral policies for each script
- Quick deployment and validation
- QSA ready reporting for 6.4.3 and 11.6.1
If you need more than a hands-on, technical workflow centered around continuous monitoring and manual policy adjustments and want to upgrade to automatic protection with enforceable control, including scalable policy enforcement, grouped data access control without constant rework, patented sandboxing prevention, and research-backed coverage, Source Defense is purpose-built for that outcome.
About Source Defense
As a PCI Participating Organization and the pioneer in eSkimming security, Source Defense played a role in the development of new requirements for web security found in PCI DSS 4.0.
We’ve helped thousands of the world’s leading brands address these issues. We’ve also been educating merchants, QSAs, PSPs, eCommerce Platform providers and virtually every stakeholder in PCI compliance on the vulnerabilities in modern website design that make eSkimming attacks possible. We’ve made it our misison to provide guidance around ambiguity in the standard; advise on the pros and cons of approaches provided by the council and we recently launched a free assessment, monitoring and management solution for both merchants and their QSAs.
