New patents are published on Tuesdays by the USPTO. Both of this week's Spotlight Patents concern aspects of digital watermarking. Assigned to Cisco, the first patent addresses techniques for embedding a watermark in block encrypted content. Assigned to Fortinet, the second patent addresses techniques for Data Leak Prevention (DLP) in an enterprise network.
9,319,752, "Robust watermark," assigned to Cisco.
A method and system for embedding a watermark in block encrypted content, including encoding a bit string, the bit string including n bits, denoted b.sub.0-b.sub.n-1, the encoding including translating each bit, b.sub.0-b.sub.n-1, into a block of data, according to the following rule if b.sub.i=1, then translate b.sub.i into a block of data of a first type, and if b.sub.i=0, then translate b.sub.i into a block of data of a second type, thereby translating the n bits into n blocks of data corresponding to each bit b.sub.0-b.sub.n-1, arranging a composite block of data including the n blocks of data, and at least one additional block indicating the presence of the n blocks of data, and inserting the composite block of data into a content item as a watermark, wherein the watermarked content item is encrypted using an ECB mode of encryption. Related methods and apparatus are also described.
9,319,417, "Data leak protection," assigned to Fortinet.
Methods and systems for Data Leak Prevention (DLP) in an enterprise network are provided. According to one embodiment a data leak protection method is provided. A network device receives information regarding a watermark filtering rule, including a sensitivity level and an action to be applied to files observed by the network device matching the watermark filtering rule. The network device scans a file attempted to be passed through the network device by locating a watermark embedded within the file and comparing a sensitivity level associated with the watermark to the sensitivity level of the watermark filtering rule. If the sensitivity levels match, then the network device performs the action specified by the watermark filtering rule.