David D. Ha
15Patents
8h-index
7Co-inventors
61Inventor score
Filing activity: Jul 21, 2000 → Feb 22, 2012
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6853728B1 | Video on demand pay per view services with unmodified conditional access functionality | Electricity | 137 | Expired |
| US7203311B1 | Super encrypted storage and retrieval of media programs in a hard-paired receiver and storage device | Electricity | 47 | Expired |
| US7225458B2 | Method and apparatus for ensuring reception of conditional access information in multi-tuner receivers | Electricity | 38 | Expired |
| US7203314B1 | Super encrypted storage and retrieval of media programs with modified conditional access functionality | Electricity | 29 | Expired |
| US7409562B2 | Method and apparatus for encrypting media programs for later purchase and viewing | Physics | 16 | Expired |
| US7457414B1 | Super encrypted storage and retrieval of media programs with smartcard generated keys | Electricity | 12 | Expired |
| US8140859B1 | Secure storage and replay of media programs using a hard-paired receiver and storage device | Electricity | 12 | Expired |
| US7804958B2 | Super encrypted storage and retrieval of media programs with smartcard generated keys | Electricity | 9 | Active |
| US7590243B2 | Digital media conditional access system for handling digital media content | Electricity | 7 | Active |
| US8677152B2 | Method and apparatus for encrypting media programs for later purchase and viewing | Physics | 6 | Active |
| US7000241B2 | Method and apparatus for minimizing conditional access information overhead while ensuring conditional access information reception in multi-tuner receivers | Electricity | 5 | Expired |
| US7480381B2 | Super encrypted storage and retrieval of media programs in a hard-paired receiver and storage device | Electricity | 3 | Active |
| US8782438B2 | Secure storage and replay of media programs using a hard-paired receiver and storage device | Electricity | 2 | Active |
| US7039955B2 | Embedded blacklisting for digital broadcast system security | Electricity | 1 | Expired |
| US7835522B2 | Embedded blacklisting for digital broadcast system security | Electricity | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.