| Class 380 | CRYPTOGRAPHY |
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![[List of Pre Grant Publications for class 380 subclass 1]](../as.gif) | ![[List of Patents for class 380 subclass 1]](../ps.gif) | 1 | CRYPTANALYSIS |
| | 2 | EQUIPMENT TEST OR MALFUNCTION INDICATION |
| | 200 | VIDEO CRYPTOGRAPHY |
| | 201 |  Copy protection or prevention |
| | 205 | Video electric signal masking |
| | 206 |  Masking of synchronization signal |
| | 207 | Including locally generated masking signal |
| | 208 | Including filter for removing masking signal |
| | 209 | Masking signal selectively addressed |
| | 210 | Video electric signal modification (e.g., scrambling) |
| | 211 | Interactive TV |
| | 212 | Plural video stream multiplexing |
| | 213 | Chrominance scrambling |
| | 214 | Nonstandard scan pattern of video information |
| | 216 | Image data converted to digital before modification |
| | 218 | Variable time delay modulation of baseband video signal |
| | 219 | Carrier phase shift |
| | 220 | Carrier frequency conversion |
| | 221 | By modifying synchronizing signal |
| | 222 |  Including phase inversion of scan line information |
| | 223 | Key signal on separate carrier |
| | 224 | Including pseudo-synchronizing pulse |
| | 225 | Self-synchronizing circuit at receiver |
| | 226 | Key signal in blanking interval |
| | 227 | Record or coin controlled |
| | 231 | Usage or charge determination |
| | 232 | Including authentication |
| | 233 | Including usage or charge recording at subscriber station |
| | 234 | Including display of supplemental information |
| | 235 | Phase inversion of scan line information |
| | 236 | Modifying accompanying audio signal |
| | 237 | Including digital audio |
| | 238 | Including frequency modification of audio signal or frequency shifting of audio carrier |
| | 239 | Encrypted code control signal |
| | 240 | Including addressed decoder control signal |
| | 243 | FACSIMILE CRYPTOGRAPHY |
| | 244 | Synchronization |
| | 245 | Nonstandard scan pattern |
| | 246 | Including generation of an associated coded record |
| | 247 | CELLULAR TELEPHONE CRYPTOGRAPHIC AUTHENTICATION |
| | 251 | ELECTRONIC GAME USING CRYPTOGRAPHY |
| | 252 | ELECTRIC SIGNAL MASKING |
| | 253 | By signal having discrete frequency component |
| | 254 | By signal having discrete step amplitude variation |
| | 255 | COMMUNICATION SYSTEM USING CRYPTOGRAPHY |
| | 256 | Fiber optic network |
| | 257 | Circuit switched network (e.g., wired telephone) |
| | 258 | Position dependent or authenticating |
| | 259 | Symmetric key cryptography |
| | 260 | Symmetric key synchronization |
| | 261 | Including frame synchronization |
| | 262 | Transmitting a seed, sequence, or initial value |
| | 263 | Nonlinear or chaotic system |
| | 264 | Key derived from addressable memory element |
| | 265 | Combining outputs of shift register |
| | 266 | Including a modem |
| | 267 | Correcting for random appearance of control character code |
| | 268 | Pseudo-random sequence scrambling |
| | 269 | Having compression |
| | 270 | Wireless communication |
| | 271 | Having receiver selection (e.g., pager) |
| | 272 | Including hand-off based cryptographic alteration |
| | 273 | Rekeying system |
| | 31 | Plural modulation of single carrier |
| | 33 | Using plural paths or channels |
| | 274 | Synchronization |
| | 35 | Variable time delay modulation |
| | 36 | Time segment interchange |
| | 38 | Frequency shift or inversion |
| | 40 | Having plural band pass filters |
| | 42 | Data stream/substitution enciphering |
| | 275 | Speech scrambler detail |
| | 277 | KEY MANAGEMENT |
| | 278 | Key distribution |
| | 286 | Key escrow or recovery |
| | 44 | Having particular key generator |
| | 28 | PARTICULAR ALGORITHMIC FUNCTION ENCODING |
| | 287 | ELECTRIC SIGNAL MODIFICATION |
| | 22 | Having magnetic record carrier (e.g., tape, drum) |
| | 26 | Having mechanical control of signal encryption (e.g., cam) |
| | 51 | Having production of printed copy (e.g., printer, typewriter) |
| | 52 | Including particular structure or housing (e.g., display, keyboard) |
| | 54 | BY MODIFYING OPTICAL IMAGE (E.G., TRANSMISSIVE OVERLAY) |
| | 55 | HAVING PRODUCTION OF PRINTED COPY (E.G., CRYPTOGRAPHIC PRINTER OR TYPEWRITER) |
| | 56 | SELECTIVELY MOVABLE ELEMENT HAVING CODE CHARACTERS |
| | 59 | MISCELLANEOUS |
| FOREIGN ART COLLECTIONS | ||
| FOR000 | CLASS-RELATED FOREIGN DOCUMENTS |
| Any foreign patents or non-patent literature from subclasses that have been reclassified have been transferred directly to FOR Collections listed below. These Collections contain ONLY foreign patents or non-patent literature. The parenthetical references in the Collection titles refer to the abolished subclasses from which these Collections were derived. | ||
| FOR103 | STORED INFORMATION ACCESS OR COPY PREVENTION (380/3) |
| FOR104 | Digital data (e.g., software program protection, data encryption) (380/4) |
| FOR105 | Video (380/5) |
| FOR106 | ELECTRIC SIGNAL MASKING (380/6) |
| FOR109 | ELECTRIC SIGNAL MODIFICATION (E.G., SCRAMBLING) (380/9) |
| FOR110 | Video (380/10) |
| FOR111 | Variable time delay modulation of baseband video signal (380/11) |
| FOR112 | Carrier phase shift (380/12) |
| FOR113 | Carrier frequency conversion (380/13) |
| FOR114 | Nonstandard scan of video information (380/14) |
| FOR115 | By modifying synchronizing signal (380/15) |
| FOR116 | Record or coin controlled (380/16) |
| FOR117 | Phase inversion of scan line information (380/17) |
| FOR118 | Facsimile (380/18) |
| FOR119 | Encrypting of accompanying audio signal (380/19) |
| FOR120 | Control coding (380/20) |
| FOR121 | Having transmission or distribution of key signal (380/21) |
| FOR148 | Having particular synchronization or initiation (380/48) |
| FOR149 | Having digital signal handling (e.g., digital control, digital computer communication) (380/49) |