Unfortunately, though, not all PDF watermarking solutions are equal. The most popular way to watermark a PDF is through Adobe’s ever-dominant Acrobat software. Though this can remain an effective (though somewhat limited) choice for printed copies,the watermarks on digital copies are trivially rem...
This special handling may include, for example, presenting or displaying handling instructions to the user, adding a watermark to a printed form of the file, or requiring encryption of the file prior to copying or transferring the file. The mechanism of the present invention may be applied to ...