Encryption, write protection and copy controls are separate requirements

Ask what is being protected

The phrase “protected USB” can refer to several different functions. USB Company’s comparison distinguishes encryption from copy restrictions, but each implementation still needs to be evaluated on its actual behaviour. Begin by defining the problem: loss of the device, accidental modification, unauthorised opening or redistribution after a recipient has access.

Those goals are related but are not interchangeable. A single label on a product page does not explain how all of them are addressed.

Distinguish access from modification

Encryption is intended to make stored data unreadable without the appropriate key or authentication. Its usefulness depends on the implementation, credential handling and the workflow around the drive. Once an authorised person opens a file, encryption alone should not be described as preventing every form of further copying.

Write protection addresses whether content on the media can be changed or deleted through the supported interface. A read-only file or partition is not the same thing as encrypted storage. It may remain possible for someone who can read the material to make another copy.

Examine copy restrictions carefully

Specialised content-protection arrangements may depend on particular software, file types, operating systems or hardware. Ask for a demonstration using your actual content and recipient environment. Clarify what happens when the files are copied, the application is unavailable or the device is replaced. Avoid a blanket promise that visible content can never be captured or redistributed.

Turn the requirement into an acceptance test

Write down the permitted and blocked actions, supported systems and recovery responsibilities. Test a sample with the responsible technical team before a bulk order. Keep valuable originals elsewhere and follow the appropriate process before any preparation that might erase a drive. Clear functional requirements make a quotation more useful than an undefined claim that the files are simply secure.