Abstract: Apparatus and methods for detecting illicit content that has been imported into a secure domain, thereby preventing an attack on a screening algorithm. A method of preventing an attack on a screening algorithm includes the steps of determining whether content submitted to a screening algorithm contains indicia indicating that the content is protected, admitting the content into a segregated location of a secure domain if it is determined that the content does not contain indicia indicating that the content is protected, and monitoring the content within the segregated location to detect whether any editing activity is performed on the content. The content is admitted into the segregated location only when it is determined that the content does not contain indicia indicating that the content is protected. The method also includes the step of determining whether the edited content contains indicia indicating that the content is protected, after editing activity is detected.

Abstract: A verification system is configured to verify the presence of an entire data set before individual data items within the set can be accessed for playback or other processing. Each data item in the data set comprises one or more sections, and the totality of sections constitute the complete data set. Each section of the data set contains a watermark that includes an identifier that confirms the presence of the section as originally recorded. The presence of the data set is confirmed by checking the watermarks of randomly selected sections to verify that the original sections that formed the data set are present, or, by maintaining a record of accessed sections to verify that a substantial portion of the data set is present. To allow for the possible noise-corruption of one or more watermarks, the verification system is configured to allow for a less-than-absolute verification.