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For the Inventor, By the Inventor

Wilmington, DE, United States of America

Contentguard Holdings, Inc.


USPTO Granted Patents = 130

% Expired Patents = 52.3



Forward Citations = 2,771

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47 inventors (with patents filed for the assignee):

goldMedal Mark Jeffrey Stefik (52 out of 143 patents)

silverMedal Xin Wang (48 out of 58 patents)

bronzeMedal Peter L T Pirolli (45 out of 78 patents)

4.  Thanh Ta (42 out of 42 patents)

5.  Michael Charles Raley (41 out of 41 patents)

6.  Guillermo Lao (39 out of 46 patents)

7.  Bijan Tadayon (28 out of 43 patents)

8.  Eddie J Chen (22 out of 22 patents)

9.  Charles P Gilliam (17 out of 17 patents)

10.  Aram Nahidipour (17 out of 22 patents)

11.  Daniel C Chen (16 out of 16 patents)

12.  Hsi-Cheng Wu (13 out of 13 patents)

13.  Thomas DeMartini (11 out of 12 patents)

14.  Steve Atsushi Okamoto (10 out of 13 patents)

15.  Edgardo Valenzuela (9 out of 9 patents)


Core Competencies:
Digital Rights Management
Content Distribution
Usage Rights
Watermarking
License Management
Future Live Events
Software Regulation
Rights Expression
Tokenized Templates
Digital Works

130 patents:

1. 10540484 - Networked services licensing system and method (2020-01-21),
2. 10430729 - System and method for specifying and processing legality expressions (2019-10-01),
3. 9953328 - Method and system for conducting transactions between repositories (2018-04-24),
4. 9898715 - Systems and methods for creating, manipulating and processing rights and contract expressions using tokenized templates (2018-02-20),
5. 9817954 - Multi-mode protected content wrapper (2017-11-14),
6. 9734506 - System and method for controlling utilization of content (2017-08-15),
7. 9727876 - System and method for permitting use of content using transfer rights (2017-08-08),
8. 9626668 - Rights expression profile system and method using templates (2017-04-18),
9. 9589111 - System for controlling the distribution and use of rendered digital works through watermarking (2017-03-07),
10. 9336366 - Method and apparatus for identifying installed software and regulating access to content (2016-05-10),
11. 8914906 - Method and apparatus for identifying installed software and regulating access to content (2014-12-16),
12. 8904545 - Method, system, and device for verifying authorized issuance of a rights expression (2014-12-02),
13. 8892473 - Method and system for subscription digital rights management (2014-11-18),
14. 8869293 - Method and apparatus for hierarchical assignment of rights to documents and documents having such rights (2014-10-21),
15. 8862517 - Digital rights management of content when content is a future live event (2014-10-14),
Contentguard Holdings, Inc. is a leading provider of digital rights management solutions, specializing in the protection and management of digital content. Headquartered in Wilmington, DE, the company focuses on technologies that enable secure content distribution, usage rights management, and watermarking. Their innovations support various applications, including license management and software regulation, ensuring that creators and distributors can effectively safeguard their intellectual property in an increasingly digital landscape.
Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

Contentguard Holdings, Inc.
130 Patents

#47 in Wilmington, DE

#60 in Delaware

#2,976 in US

#6,173 in the World

Wilmington, DE (US)
Wilmington, DE, United States of America

Contentguard Holdings, Inc.

Forward Citations = 2,771

47 inventors:

goldMedal Mark Jeffrey Stefik (52 out of 143 patents)

silverMedal Xin Wang (48 out of 58 patents)

bronzeMedal Peter L T Pirolli (45 out of 78 patents)

4.  Thanh Ta (42 out of 42 patents)

5.  Michael Charles Raley (41 out of 41 patents)

Please report any incorrect information to [email protected]
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