This document describes an evaluation method to assess the robustness of watermarking implementations in unstructured digital content, including images, video, audio, and documents. This document describes attacks and corruptions that may result in the quality compromise of the watermarking information embedded in digital content. Furthermore, the document specifies robustness requirements for implementations of digital watermarking in the digital content. Moreover, the document defines metrics used for the evaluation and the test cases for assessing the robustness against different corruptions or attacks. This document does not specify the evaluation for the robustness of the watermarking implementations in structured content, for example, database. The risks faced with watermarking implementations in structured content are different from those of unstructured content, and need different test cases.