A Watermarking Technique Based on File Page Objects for PDF
Umair Khadam, Muhammad Munwar Iqbal, Muhammad Asif Habib, Kijun Han · 2019
This paper presents a novel algorithm which is based on the Portable Document Format (PDF) document structure. The PDF document page objects are utilized for watermarking. The secret message is compressing by using Huffman coding, then suitable page objects of PDF document are used for hiding the secret message. Since the embedded watermark information is stored in PDF document page objects, so it will not affect the content, as well as the format of the PDF documents. The experimental result shows that the proposed algorithm is robust with detection accuracy can be up to 97%. The watermark is extracted with high probability, which illustrates that the proposed algorithm is robust and imperceptible. The experiments prove that the proposed method is suitable for PDF documents protection.