1. Use secure connections: Ensure that all connections to your website, landing pages, and lead forms are encrypted with HTTPS protocol. This can be achieved by using SSL/TLS certificates. 

2. Use strong passwords: Use strong passwords for all accounts and change them regularly. Avoid using easily guessable passwords such as “password123” or “admin”.

3. Limit access: Limit access to sensitive data only to those who need it. This can be achieved by implementing access controls and permissions.

4. Use encryption: Use encryption to protect sensitive data such as customer information, payment details, and login credentials.

5. Regularly update software: Keep all software and applications up to date with the latest security patches and updates.

6. Use firewalls: Use firewalls to prevent unauthorized access to your network.

7. Regularly backup data: Regularly backup your data to prevent data loss in case of a security breach or system failure.

8. Use two-factor authentication: Use two-factor authentication to add an extra layer of security to your accounts.

By implementing these measures, you can help ensure that your customers’ data is secure and protected in digital marketing. Additionally, it’s important to have a comprehensive data security policy that outlines how data is collected, stored, and used, along with procedures for handling security incidents. Regular security audits and risk assessments can also help identify potential vulnerabilities and ensure your data security measures remain effective.