A text digital watermarking algorithm for PDF document based on scrambling technique
Yang Yang · Journal of Foshan University · 2009
A text digital watermarking algorithm for PDF document based on scrambling technique is proposed.The watermark image is first encrypted by scrambling technique.Then,the original PDF document is transformed into PS file.The binary watermark image with its location information is embedded into the character spacing of the PS file.Finally,we can get the PDF document containing watermark through the PS file.