Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7949133 | Controlled cryptoperiod timing to reduce decoder processing load Systems and methods are disclosed for enabling encryptor devices to provide real-time messages having offset cryptoperiods according to an offset algorithm within common crypto-sync pulse boundaries. A master clock aligns the encryptor devices to a common crypto-syn... | 05/24/2011 |
| 7555125 | Systems and methods for generation of time-dependent control signals for video signals Systems and methods for generation of time-dependent control signals for video signals are provided. A system is provided that includes a set of microsequencers, a programmable combinational logic (PCL) module, shared memory, an arbiter for sharing of memory by the ... | 06/30/2009 |
| 7363620 | Non-linear execution of application program instructions for application program obfuscation Obfuscating an application program comprises reading a first application program, determining an application program instruction location permutation that transforms the first application program into an obfuscated application program having at least one application... | 04/22/2008 |
| 7352862 | Encryption method, communication system, transmission device, and data input device An encryption method includes the steps of (a) generating random data including a first part and a second part, the first part specifying an operation to be performed on plain text data and the second part being used in the operation, (b) performing the specified op... | 04/01/2008 |
| 7353499 | Multiple instruction dispatch tables for application program obfuscation Obfuscating an application program comprises reading an application program comprising code, determining multiple dispatch tables associated with the application program, transforming the application program into application program code configured to utilize the di... | 04/01/2008 |
| 7321660 | Method and apparatus for encrypting/decrypting data using timed-release keys A computer system comprises a first computer entity arranged to encrypt data using an encryption key comprising a time value, and a second computer entity arranged to generate, at intervals, a decryption key using a current time value. The encryption and decryption ... | 01/22/2008 |
| 7310518 | Serving roaming mobiles with incorrectly programmed identifiers A method is provided for supplying service to mobile stations (MS) (20) utilizing a wireless telecommunications network (A). Each of the MS has a home country and a home network and is programmed with an identifier comprising a number including a set of digit... | 12/18/2007 |
| 7305088 | Video distribution playback method, apparatus to be disposed on video distribution end, apparatus to be disposed on video playback end, computer readable medium, and movie distribution method A motion-picture distributor (12) uses a computer system (22) to convert video signals from a master film (14) into serial video data (41) complying with DVD-Video standards. Further, the computer system (22) modifies the sequence ... | 12/04/2007 |
| 7272718 | Device, method and storage medium for superimposing first and second watermarking information on an audio signal based on psychological auditory sense analysis In a signal processing device and its method as well as a program storing medium, psychological auditory sense analysis of the survival state of an input signal of the time when the input signal has been compressed is performed in response to the compression process... | 09/18/2007 |
| 7221759 | Projector with enhanced security camcorder defeat A projector (10) with enhanced security camcorder defeat including a copy protection illumination system (1) for illuminating a spatial light modulator (30) comprises: a polychromatic light source (20); uniformizing optics (22) for... | 05/22/2007 |
| 7218738 | Encryption and content control in a digital broadcast system A selective encryption encoder has a packet identifier that identifies packets of a specified packet type forming a part of a program. A packet duplicator duplicates the identified packets to produce first and second sets of the identified packets. A PMT (program ma... | 05/15/2007 |
| 7215770 | System and method for partially encrypted multimedia stream A multimedia stream head end includes a legacy conditional access (CA) device that fully encrypts the stream using legacy keys. A copy of the stream is sent to a secondary CA device that encrypts only critical packets in the stream using secondary keys to render a p... | 05/08/2007 |
| 7212636 | Encryption of a compressed video stream A method for encrypting a compressed video stream comprising independent data blocks and differential data blocks includes the steps of encrypting the independent data blocks with a different level of encryption than that used for the differential data blocks. In on... | 05/01/2007 |
| 7178030 | Electronically signing a document A method of electronically signing a document includes initializing a user, including generating an asymmetric key pair including a private signing key and a public signing key, and storing the private signing key and the public signing key; and providing an electro... | 02/13/2007 |
| 7146506 | Digital video display system A system for receiving and processing digital video information such as a digital television broadcast, includes a modular platform which receives a plurality of hot pluggable cards. The platform is coupled by a high data rate graphics bus to a digital television di... | 12/05/2006 |
| 7050698 | Method and apparatus for synthesizing or modifying a copy protection signal using a lowered signal level portion A modified Colorstripe™ copy protection process utilizes a basic anti-copy protection (ACP) signal that causes attenuation of a video signal, wherein, in one embodiment, the process modifies (lowers) the level of a front porch portion and adds an incorrect color s... | 05/23/2006 |
| 7043019 | Copy protection for digital motion picture image data An apparatus and method for displaying a copy-deterrent pattern (104) within a digital motion picture in order to discourage recording of the motion picture using a video camera or other sampling recording device. A copy-deterrent pattern (104) could b... | 05/09/2006 |
| 6882839 | One-way roaming from ANS-41 to GSM systems Disclosed is a method and apparatus for providing authentication for a subscriber of a wireless communication system employing one type of authentication technology roaming into a wireless communication system employing a second type of authentication technology. Th... | 04/19/2005 |
| 6711261 | Enhancing concealment in the presence of fine mistuning for various TV scrambling techniques An improved method and apparatus for maintaining concealment for a scrambled signal when frequency pre-emphasis is used to defeat the scrambling. The pre-emphasis may be synthesized with high pass or peaking circuitry. More commonly however the pre-emphasis is avail... | 03/23/2004 |
| 6584310 | Method and apparatus for performing authentication in communication systems A method and apparatus for permitting global roaming between two communication networks which utilize different authentication schemes. The authentication interoperability function (AIF) and method translate between the authentication schemes of each netw... | 06/24/2003 |
| 6243465 | Method of providing video programming nearly on demand A method for providing video programming in a nearly on demand basis is disclosed. A video network includes a video server that operates several video recorders to simultaneously exhibit video performances or programs on a plurality of channels. The video... | 06/05/2001 |
| 6009172 | Method and apparatus for optimizing scrambling concealment of a video signal by modifying a specialized sync pulse A technique for improving the scrambling concealment of a video signal and the like when displayed on a television set or monitor, includes the pulse width and/or pulse position modulation of a horizontal sync pulse in a horizontal blanking interval by ti... | 12/28/1999 |
| 5844988 | Method and apparatus for scrambling and descrambling of video signal with edge fill A video-scrambling system induces a random wobble i.e., time shifting, in the location of active portion of the video frame, without affecting the horizontal sync signal and colorburst in each video line, thus providing both security and concealment. The ... | 12/01/1998 |
| 5841863 | Method and apparatus for scrambling and descrambling of video signals with edge fill A video-scrambling system induces a random wobble i.e., time shifting, in the location of active portion of the video frame, without affecting the horizontal sync signal and colorburst in each video line, thus providing both security and concealment. The ... | 11/24/1998 |
| 5671278 | Video scrambling with variable function generator A video scrambling and descrambling arrangement utilizes plural scrambling characteristics including a predetermined scrambling waveform and a selectable one of a plurality of phase relationships with respect to the video signal to be scrambled. Descrambl... | 09/23/1997 |
| 5617475 | Scrambling and descrambling of video signals using horizontal line combinations A plurality of video lines in a raster scan video image are scrambled by delaying a first video line in time equal to the horizontal line scan time for the raster scan video field to produce a delayed first video line. The delayed first video line is inve... | 04/01/1997 |
| 5608799 | Method and apparatus for scrambling and descrambling of video signal with edge fill A video-scrambling system induces a random wobble i.e., time shifting, in the location of active portion of the video frame, without affecting the horizontal sync signal and colorburst in each video line, thus providing both security and concealment. The ... | 03/04/1997 |
| 5579390 | Method and apparatus for vertically scrambling and descrambling of video signals A video-scrambling system induces a random wobble i.e., time shifting, in the location of active portion of the video frame, without affecting the horizontal sync signal and colorburst in each video line, thus providing both security and concealment. The ... | 11/26/1996 |
| 5553141 | Encryption and decryption (scrambling and unscrambling) of video signals A video signal is encrypted by pseudo-random variation of portions of lines thereof to be horizontally scanned that are devoid of video information. Thus, the durations of line blanking intervals may be varied. The variation is done in accordance with an ... | 09/03/1996 |
| 5504815 | Method and apparatus for scrambling and descrambling A video-scrambling system induces a random wobble i.e., time shifting, in the location of active portion of the video frame, without affecting the horizontal sync signal and colorburst in each video line, thus providing both security and concealment. The ... | 04/02/1996 |
| 5438620 | Method and apparatus for scrambling and descrambling of video signal with edge fill A video-scrambling system induces a random wobble i.e., time shifting, in the location of active portion of the video frame, without affecting the horizontal sync signal and colorburst in each video line, thus providing both security and concealment. The ... | 08/01/1995 |
| 5410601 | Video scramble system and equipment The object of the present invention is to provide various scramble systems and equipments for embodying the scramble systems for omitting unqualified viewers in a pay TV system such as CATV. One of the scramble system according to the present invention is ... | 04/25/1995 |
| 5212723 | Burst phase correction system for video descrambling A method and apparatus for synchronizing a randomized video signal to a phase-locked sampling system. The phase-locked system is part of a scrambling apparatus capable of scrambling and subsequent descrambling of video signals recorded on videotape record... | 05/18/1993 |
| 5161188 | Scrambling video by horizontal and vertical time shifting A system for scrambling and descrambling the image associated with a video signal employs the shifting in time of a video image after removal of vertical and horizontal synchronization, and color burst reference signals. Coded data which contains informat... | 11/03/1992 |
| 5146496 | Method and apparatus for enhancing the security of a scrambled television signal The scrambling security of a sync suppressed television signal is enhanced by eliminating the fixed time relationship between the normal color burst component and synchronization information in successive lines of the television signal. Transmission of a ... | 09/08/1992 |
| 5058157 | Method and apparatus for encrypting and decrypting time domain signals A technique for encrypting and decrypting information signals normally arranged as a succession of lines of active information, with each line having a line timing reference, such as color video information signals. The active video portion is time shifte... | 10/15/1991 |
| 5003592 | Scrambling video by time shifting A system for scrambling and descrambling the image associated with a video signal employs the shifting in time of a video image after removal of synchronization and color burst reference signals. Coded data which contains information necessary for unscram... | 03/26/1991 |
| 4916736 | Method and apparatus for encrypting and decrypting time domain signals Time sequential information signals, such as color video signals having a line timing reference and an active video portion, are encrypted by time shifting the active video signal portion towards and away from the line timing reference signal in psuedo-ra... | 04/10/1990 |
| 4901349 | Time dispersal encryption of TV signals In encrypting a video signal for communications security, the horizontal synchronization pulses are removed, the active signal portions of each line in a field are delayed according to psuedorandom sequence of delays, and the reference color burst is move... | 02/13/1990 |
| 4642688 | Method and apparatus for creating encrypted and decrypted television signals A method and apparatus for creating a television signal and encrypting or decrypting the signal at the same time. Luminance and chrominance information are received by the apparatus and stored in separate television scan line stores. The stored liminance ... | 02/10/1987 |
