| Patent application number | Description | Published |
|---|
| 20080215889 | Efficient Watermark Detection - A system and a method of effectively detecting watermarks in a significant amount of data signals. The method, in overview, consists in pre-filtering the significant amount of data signals in order to eliminate from the final watermark detection the segments of the data signals which have no significant relevance to the owner of the copyrights of the watermark under investigation, and then performing the actual watermark detection over the remaining segments of data signals relevant to the investigation. The pre-filtering feature being implemented by a definition of one or more goal descriptors, extraction of one or more descriptors from the data signals and its content and a comparison between goal descriptors and extracted descriptors. | 09-04-2008 |
| 20080240435 | Perpetual Masking For Secure Watermark Embedding - Disclosed are a method and a system for secure watermark embedding in a server-client configuration ( | 10-02-2008 |
| 20080250240 | Remote Informed Watermark Detection System - A system and a method for secure remote informed watermark detection making use of a side-information. The system in overview comprises a remote detector and a server computing system wherein a database with side-information assigned to specific descriptors of data signals is stored at the server computing system and wherein a remote detector intending to identify the watermark of a data signal will derive the descriptor of the data signal and subsequently contact the trusted server computing system in order to obtain the necessary side-information for the informed watermark detection. | 10-09-2008 |
| 20080310629 | Multibit Forensic Watermark with Encrypted Detection Key - The invention relates to embedding auxiliary data in the form of a multibit payload in a host signal, and encrypting the associated detection key. Moreover, the invention relates to extracting the auxiliary data in the form of the multibit payload from a data signal. Auxiliary data is embedded in a host signal by the following steps. First a reference watermark is provided, subsequently an encrypted detection key associated only with the reference watermark is generated. The encrypted detection key may be a scrambled version of the watermark. In a further step, the multibit watermark is generated and a multibit payload is encoded into the reference watermark. Finally, the multibit watermark is embedded into the host signal. | 12-18-2008 |
| 20090013188 | Search for a Watermark in a Data Signal - The invention relates to a method of searching for a watermark in a data signal, and to a watermark detector, such as a copy-control watermark detector. The search is conducted in order to find a watermark in content which possibly has been attacked and/or altered. The search is conducted by the steps of determining or setting a search space for the data signal, selecting a subspace of the search space, and searching for the presence of the watermark in the subspace. The subspace may be selected from a multitude of regions, the selection e.g. being based on a deterministic or probabilistic function. | 01-08-2009 |
| 20090136026 | WATERMARK EMBEDDING USING LOOK-UP TABLES - The invention relates to embedding a spread spectrum watermark in a data signal as well as to detection of the embedded watermark. A data signal ( | 05-28-2009 |
| 20090208019 | METHOD AND APPARATUS FOR ENCRYPTING/DECRYPTING DATA - The present invention relates to a method and apparatus for encrypting data ( | 08-20-2009 |
| 20100058065 | EXTRACTING AUXILIARY DATA FROM A HOST SIGNAL - The invention relates to extracting and embedding auxiliary data from and to a host signal. In an embodiment, the auxiliary data relates to remotely control of an application or a device, such as an interactive toy. Auxiliary data are extracted from a host signal, by periodically ( | 03-04-2010 |
| 20100082478 | APPARATUS & METHODS FOR DIGITAL CONTENT DISTRIBUTION - The present invention relates to methods and apparatus for digital content distribution. A method of transferring digital content from a first entity ( | 04-01-2010 |
| 20100177888 | WARERMARKING AND ENCRYPTION OF ENTROPY-CODED DATA USING ADDITIVE HUFFMAN TABLE - A secure forensic watermarking system is disclosed that distributes the same encrypted content to all users. The decryption key is different for each user, so that the decrypted content differs slightly from the original, i.e. is watermarked. Forensic tracking is possible by distributing unique decryption keys to individual users. The invention allows a forensic mark to be securely embedded in the compressed domain signal. In an embodiment of this invention, the content (x) and an encryption sequence (r) are entropy encoded using a homomorphic Huffman table. A homomorphic Huffmann table is a table H having the property that there exists an operation f( ) such that H- | 07-15-2010 |
| 20100287201 | METHOD AND A SYSTEM FOR IDENTIFYING ELEMENTARY CONTENT PORTIONS FROM AN EDITED CONTENT - This invention relates to a method and a system for identifying elementary content portions from an edited content. A log is generated indicating the elementary content portions used in the edited content. Fingerprints are obtained from the elementary content portions as indicated in the log. Characteristic information is determined about the elementary content portions by comparing the fingerprints to fingerprints of registered content having associated characteristic information. | 11-11-2010 |
