Koninklijke Philips Corporation N.v.

André Weimerskirch

Laszlo Hars

Antonius A M Staring

Apparatus and methods for attacking a screening algorithm. Content to be downloaded is identified. The identified content is then partitioned into at least two sections, wherein each of the at least two sections has a duration which is less than a duration of a threshold duration value assigned by the screening algorithm, and the partitioned content is subjected to a screening algorithm. Once the content has been successfully downloaded, the integrity of the downloaded content may be restored by reassembling the sections.

Apparatus and methods for attacking a screening algorithm based on partitioning of content

A method for authorizing the rendering of a digital recording. A first section and a last section of a track is first identified. A watermark is then decoded from the first and last sections of the track. It is then determined if at least one reserved bit is marked in the watermark in each of the first and last sections of the track. If so, it is determined if the sequence IDs of sections interposed between the first and last sections of the track are in sequential order. If both conditions are met, the rendering is authorized.

Method and apparatus to prevent the unauthorized copying of digital information

A method and apparatus are disclosed for preventing noise from influencing a random number generator that is based on the meta-stable behavior of flip-flops. External noise will affect multiple flip-flops in a larger random number generator circuit in the same way, since they are physically close. Thus, the ability to influence the operation of a random number generator using external noise is reduced by incorporating a plurality of flip-flops, referred to herein as core random elements, in a single random number generator. If one of the core random elements in a random number generator is influenced by noise, all of the core random elements will be influenced by the noise. Thus, if all (or most) of the core random elements issue a random bit at the same time, there is a possibility that the random number generator was influenced by noise, and all the issued bits are discarded. One or more mechanisms are incorporated into the random number generator to ensure that a random bit is not generated when a plurality of the core random elements generate a bit at the same time.

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Eppstein, Germany

André Weimerskirch