How External Hardware Keys Secure Digital Purchases and Downloads
A system using a physical hardware device to prove your identity to a server, allowing you to securely download and decrypt digital assets.
Original patent title: “System, device, and method for providing secure electronic commerce transactions”
A system using a physical hardware device to prove your identity to a server, allowing you to securely download and decrypt digital assets. Granted to Line 6 Inc in 2008 with 16 claims and 16 forward citations.
Key facts
Coverage
What does this patent actually cover?
This patent describes a hardware-based security system where a physical device, like a USB dongle, connects to a computer to authenticate a user. When the computer tries to access a server, the server asks the hardware device for a unique serial number. If the serial number is recognized, the server sends a digital challenge to the device. The device uses a secret key stored in its secure memory to solve the challenge and sends the answer back. If the answer is correct, the server confirms the user's identity and can send encrypted digital assets that only that specific hardware device can help decrypt.
The gap
What does this patent NOT cover?
- Does not cover software-only authentication methods like passwords or two-factor authentication codes sent via SMS.
- Does not cover authentication methods that do not use a physical, separate hardware device connected via an I/O connector.
- Does not cover biometric authentication such as fingerprint or facial recognition systems.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
The system links the physical hardware identity to the decryption process: the server encrypts the asset key using the user's secret hardware key, meaning the file is useless without the specific physical device to unlock it.
Schematic visualization of the patent's claim structure. Hand-drawn diagrams in progress for each landmark patent.
Where you've seen this
Real-world examples
Line 6 hardware dongles for audio software authorization
Physical USB security keys used for software licenselicensePermission from the patent owner to make, use, or sell the invention — usually in exchange for payment. Doesn't transfer ownership.Read more → management
Hardware-locked digital content delivery systems
Why it matters
The bigger picture
This technology was developed by Line 6, a company known for digital guitar modeling and audio equipment. It provided a way to protect intellectual property, such as digital audio software or presets, by ensuring that only users with the physical hardware key could access and decrypt the purchased content. It represents an early approach to hardware-locked digital rights management (DRM) for professional creative tools.
Filed
January 16, 2002
Granted
July 22, 2008
Market context
Who's building on this
Companies in this space
Line 6, now a subsidiary of Yamaha, continues to manage hardware-software ecosystems. The broader concept of hardware-backed security is currently dominated by companies like Yubico and major platform holders who use Trusted Platform Modules (TPM) to bind software to specific hardware.
Market impact
This patent reflects a period when software companies were struggling to prevent piracy of expensive creative tools. It helped formalize the use of physical 'dongles' as a standard for high-end professional software, effectively creating a secure bridge between local hardware and remote servers for licenselicensePermission from the patent owner to make, use, or sell the invention — usually in exchange for payment. Doesn't transfer ownership.Read more → validation.
Claim 1 — Plain English
What this patent covers
This patent describes a hardware-based security system where a physical device, like a USB dongle, connects to a computer to authenticate a user. When the computer tries to access a server, the server asks the hardware device for a unique serial number. If the serial number is recognized, the server sends a digital challenge to the device. The device uses a secret key stored in its secure memory to solve the challenge and sends the answer back. If the answer is correct, the server confirms the user's identity and can send encrypted digital assets that only that specific hardware device can help decrypt.
The clever bit
The system links the physical hardware identity to the decryption process: the server encrypts the asset key using the user's secret hardware key, meaning the file is useless without the specific physical device to unlock it.
What it does not cover
- Does not cover software-only authentication methods like passwords or two-factor authentication codes sent via SMS.
- Does not cover authentication methods that do not use a physical, separate hardware device connected via an I/O connector.
- Does not cover biometric authentication such as fingerprint or facial recognition systems.
Patent timeline
Application submitted to the patent office
Application published, typically 18 months after filing
Patent officially issued
PatentBrief Score
Impact Score
Moderate
Citation count
25/40
Moderately cited
Claim breadth
11/20
Broad claimsclaimsThe numbered statements at the end of a patent that legally define what the inventor owns.Read more →
Recency
5/20
Granted 10–20 years ago
Assignee scale
0/20
Independent or smaller assigneeassigneeThe entity that owns the patent — usually the inventor's employer or a company.Read more →
PatentBrief Impact Score — based on citation count, claim breadth, recency, and assignee scale. Not a legal assessment.
Heuristic Value Estimate
What this patent might be worth
$28K – $90K
Midpoint $56K · expired or expiring · industry ×1.6
Heuristic only — blends forward/backward citation counts, claim scope, time remaining, litigation history, and CPC-derived industry baseline. Real valuations need a professional appraisal.
The original legal language
Original claims
16 claims as filed with the patent office.
Concepts involved
Citations
Patent lineage
Cite this patent
Longawa, J., Ryle, M., Rampley, R., Brinkman, J., Randall, C. C., & Hamilton, D. (2008). How External Hardware Keys Secure Digital Purchases and Downloads (U.S. Patent No. 7,404,202). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/7404202/netflix-dvd-by-mail-queue
Auto-generated from the patent record. Double-check author order and the issue date against the official USPTO document before submitting.
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Common Questions
Frequently Asked Questions
What does How External Hardware Keys Secure Digital Purchases and Downloads cover?
A system using a physical hardware device to prove your identity to a server, allowing you to securely download and decrypt digital assets.
Who owns patent US 7404202?
Line 6 Inc owns this patent, granted in 2008.
When does this patent expire?
This patent is expected to expire on July 22, 2028, when the invention enters the public domain.
What is patent US 7404202 cited by?
This patent has been cited by 16 later patents that build on its ideas.
What problem does this patent solve?
This technology was developed by Line 6, a company known for digital guitar modeling and audio equipment. It provided a way to protect intellectual property, such as digital audio software or presets, by ensuring that only users with the physical hardware key could access and decrypt the purchased content. It represents an early approach to hardware-locked digital rights management (DRM) for professional creative tools.
What does this patent NOT cover?
Does not cover software-only authentication methods like passwords or two-factor authentication codes sent via SMS.
Patent monitoring