Method for quickly embedding and extracting information for PDF document protection and distribution tracking
An extraction method and document technology, applied in the field of information hiding, which can solve problems such as limited algorithm capacity, complex algorithm, and document collapse.
Active Publication Date: 2019-07-12
HANGZHOU KILBYBLOCK CHAIN TECH LTD
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Problems solved by technology
The latest representative algorithms of the first type of algorithm mainly include the new object algorithm and the reference table blank character algorithm. The object flow relationship is easy to cause document collapse; while the blank character algorithm of the reference table is limited to the use of versions below PDF1.5
The latest representative algorithms of the second type of algorithms mainly include feature coding, word shift coding, and line shift coding. The capacity of these algorithms is not high and the algorithm is complex
The representative algorithm of the third type of algorithm is an algorithm based on the syntax and semantics of Chinese characters, but it destroys the visibility of the document and the algorithm capacity is limited
In general, there is currently a lack of PDF watermarking algorithms that achieve a good balance between capacity, robustness, and concealment, and the algorithm is not fast enough, and does not consider multiple embeddings to simultaneously achieve the purpose of copyright protection and distribution tracking
Method used
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[0038] Embodiments of the present invention are described in detail below, wherein the same or similar reference numerals represent the same or similar elements or elements with similar functions. The embodiments described below by referring to the figures are exemplary, and are only used to explain the present invention and not to limit the present invention.
[0039]Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as commonly understood by those of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and unless defined as herein, will not be used in an idealized or overly formal meaning to explain.
[0040] The present invention will be further described below in c...
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The invention discloses a method for quickly embedding and extracting information for PDF document protection and distribution tracking, which comprises a first PDF document, first embedded information and distribution tracking embedded information. The first PDF document is processed by the first embedded information to form a copyright protection document. The distribution tracking embedded information comprises multiple embedded information, and the multiple embedded information are used for carrying out information embedding on the copyright protection document to form multiple embedding and confirm a distribution tracking sender and a purchaser. Forward and reverse processing on the first PDF document is performed through an embedding method and an extracting method respectively, namely, carrying out reverse processing on the embedding method through the extracting method. The method for quickly embedding and extracting the information for PDF document protection and distributiontracking is simple, quick and effective and has multiple information hiding functions.
Description
technical field [0001] The present invention relates to the technical field of information hiding, more specifically, it relates to a method for quickly embedding and extracting information for PDF document protection and distribution tracking. Background technique [0002] PDF (Portable Document Format) is a cross-platform, cross-media open electronic document format, which is widely used in print publishing, electronic publishing and online publishing. PDF files are based on the PostScript language image model, which can guarantee accurate colors and accurate printing effects no matter what kind of printer is used, that is, PDF will faithfully reproduce every character, color and image of the original. The purpose of Adobe's design of the PDF file format is to support cross-platform, multimedia-integrated information publication and distribution, especially to provide support for network information distribution. It is precisely because of the various advantages of PDF fi...
Claims
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IPC IPC(8): G06F21/16
CPCG06F21/16
Inventor 陆哲明归加琪郁发新罗雪雪
Owner HANGZHOU KILBYBLOCK CHAIN TECH LTD