This document summarizes a DCT-based watermarking technique that allows detection of the watermark from a corrupted image without needing the original uncorrupted image. The technique embeds a watermark by modifying mid-frequency DCT coefficients of an image. During detection, the watermark is recovered by correlating the extracted DCT coefficients against different potential watermarks and selecting the one with the highest correlation. This avoids the need for the original image by directly correlating against watermarks rather than trying to estimate the original coefficients.