A Rights Management Services Client Access License (CAL) and a Windows Server Client Access License (CAL) is required for each user or device that accesses the Rights Management Services software. You'll need a user or device CAL for each user or device that accesses the software.
 
Rights Management Services (RMS) 2025 CAL - 1 User is designed to provide businesses with secure and flexible document access management. This license is essential for companies looking to safeguard sensitive information, enforce document rights policies, and ensure compliance across digital platforms. With RMS, organizations can easily protect and control documents both inside and outside the company network. The 1 User CAL allows individual users to access and manage protected content seamlessly.

A Rights Management Services (RMS) 2025 User Client Access License (CAL) is essential for several reasons:
 
Access Control: An RMS User CAL allows a specific user to access the RMS features from any device. This is particularly useful in environments where users need to access protected documents and emails from multiple devices, ensuring consistent access control.
 
Compliance and Legal Requirements:Microsoft’s licensing terms mandate that every user or device accessing RMS must have a corresponding CAL. This ensures that organizations remain compliant with licensing agreements, avoiding potential legal and financial penalties.
 
Enhanced Security:RMS User CALs help manage and secure access to sensitive information by ensuring that only authorized users can access protected content. This is crucial for maintaining the integrity and security of the organization's data.
 
Cost Efficiency: In scenarios where users need to access RMS from multiple devices, a User CAL can be more cost-effective than purchasing individual Device CALs for each device. This helps optimize licensing costs while ensuring compliance.

Flexibility in Licensing: User CALs provide flexibility in environments with a high user-to-device ratio. They are ideal for situations where users need to access RMS from various devices, ensuring that each user is properly licensed regardless of the number of devices they use.
 
Simplified Management: Managing User CALs can be simpler in certain environments, as it involves tracking the number of users rather than individual devices. This can streamline the administrative process and reduce the complexity of license management.
 
By ensuring that each user accessing RMS is properly licensed, RMS User CALs help maintain compliance, optimize costs, and provide flexibility in various organizational setups.