Provided is a method of embedding and extracting watermark data that is robust against geometric distortion and low-quality photographing and for which the probability of successfully extracting watermark data for an original image is high, while the probability of successfully extracting the watermark data in the case of unauthorized copying is seriously impaired. The data embedding method according to an embodiment of the present invention comprises a step of converting the noise-based image using watermark data, and a step of adjusting the original image using the converted noise-based image.

The present invention discloses methods and systems for tagged-signal verification. Methods include: upon obtaining original content, generating identity and semantic signatures; superposing the identity signature on the content as an in-band digital watermark; utilizing the semantic signature by: superposing on the content or storing; transmitting a tagged signal combining watermark and content; upon receiving the tagged signal with a verification request, extracting transmitted content; extracting the watermark to retrieve a transmitted identity signature; determining the transmitted identity signature is valid by comparing to the original; obtaining the original semantic signature either by: extracting from the watermark, or retrieving a stored version; generating a transmitted semantic signature; verifying the transmitted semantic signature is identical to the original; determining the transmitted content is tamper-free and identical to the original, or has been manipulated; and transmitting a confirmation notification vouching for the authenticity as a genuine version, or designating as a tampered version.

Techniques for signer-initiated electronic document signing via an electronic signature service using a mobile or other client device are described. Example embodiments provide an electronic signature service (ESS) configured to facilitate the creation, storage, and management of documents and corresponding electronic signatures. In some embodiments, when a signer user receives a hard copy (e.g., paper) signature document, the signer may capture an image of the signature document with a camera of a mobile device. The signer can then import the captured image into the ESS for signature, storage, and/or transmission to other parties.

Essentially coincident with the capture of an image by the imaging device, biometric information indicating the identity of the operator of the device is obtained from at least one biometric sensor. The biometric information and captured image are then stored in a manner reliably associating each with the other. At a later time, biometric information is obtained from a supposed operator of the imaging device. By comparing this candidate biometric information with the stored biometric information, the supposed operator may be authenticated as the operator of the imaging device at the time of capture of the stored image.

Provided is a method of embedding and extracting watermark data that is robust against geometric distortion and low-quality photographing and for which the probability of successfully extracting watermark data for an original image is high, while the probability of successfully extracting the watermark data in the case of unauthorized copying is seriously impaired. The data embedding method according to an embodiment of the present invention comprises a step of converting the noise-based image using watermark data, and a step of adjusting the original image using the converted noise-based image.

Provided is a method of embedding and extracting watermark data that is robust against geometric distortion and low-quality photographing and for which the probability of successfully extracting watermark data for an original image is high, while the probability of successfully extracting the watermark data in the case of unauthorized copying is seriously impaired. The data embedding method according to an embodiment of the present invention comprises a step of converting the noise-based image using watermark data, and a step of adjusting the original image using the converted noise-based image.

Systems and methods for rendering a secure document with a text selection capability. The methods comprise, by a processor creating a graphic that includes at least one non-text object of a source document and a watermark, adding the graphic onto a base document, and creating a secure document by adding one or more text objects from the source document onto the base document, the secured document configured to enable text selection of the one or more of the added text objects. The secure document includes a file format that is different than that of the source document.

Techniques for signer-initiated electronic document signing via an electronic signature service using a mobile or other client device are described. Example embodiments provide an electronic signature service (ESS) configured to facilitate the creation, storage, and management of documents and corresponding electronic signatures. In some embodiments, when a signer user receives a hard copy (e.g., paper) signature document, the signer may capture an image of the signature document with a camera of a mobile device. The signer can then import the captured image into the ESS for signature, storage, and/or transmission to other parties.

Provided is a method of embedding and extracting watermark data that is robust against geometric distortion and low-quality photographing and for which the probability of successfully extracting watermark data for an original image is high, while the probability of successfully extracting the watermark data in the case of unauthorized copying is seriously impaired. The data embedding method according to an embodiment of the present invention comprises a step of converting the noise-based image using watermark data, and a step of adjusting the original image using the converted noise-based image.

A function of a device is displayed as a first display on a client device, and local user authentication information is displayed as a second display according to the function of the device selected on the first display on the client device.