Unlock instant, AI-driven research and patent intelligence for your innovation.
Signature watermark system used for CAD (Computer-Aided Design) documents
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A document and watermarking technology, which is applied in image data processing, equipment, program/content distribution protection, etc., can solve the problems of CAD signature system to restore documents, such as difficulty in restoring documents, unable to confirm the issuer, etc., to achieve security protection and ensure integrity Effect
Inactive Publication Date: 2011-07-06
HARBIN INST OF TECH
View PDF1 Cites 7 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0005] The purpose of the present invention is to solve the problem that the existing CAD signature system is difficult to restore the document; even if it is combined with encryption to protect the document, there is still a problem that the issuer cannot be confirmed
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
specific Embodiment approach 1
[0041] Specific implementation mode one: the following combination Figure 1 to Figure 8 Describe this embodiment mode, a kind of signature watermark system for CAD document described in this embodiment mode, it comprises a signature module, a stamp verification module and a recovery module,
[0042] The signature module is used to decompose the set stamp shape and embed it into the original CAD document, and embed the signature information watermark and tampering location information watermark for signature, and then release the signed CAD graphics;
[0043] The seal verification module is used to verify the integrity of the received signed CAD document: extract the signature information of the CAD document to verify whether the signature of the CAD document is forged; restore the watermark graphic of the CAD document, It is used to verify whether the CAD document has been tampered with, and when the graphics have been tampered with, it can give tampered location information;...
specific Embodiment approach 2
[0049] Specific implementation mode two: the following combination figure 1 with figure 2 Describe this implementation mode. This implementation mode will further explain the first implementation mode. The workflow of the signature module is as follows:
[0050] Step 1, judging whether the CAD document has been stamped,
[0051] If the judgment result is yes, exit the program; if the judgment result is no, execute step 2;
[0052] Step 2, stamping the CAD document to obtain a stamp-shaped CAD document;
[0053] Step 3, embedding the signature information watermark of the CAD document on the stamp-containing CAD document;
[0054] Step 4: Embedding the tampering information watermark of the CAD document on the stamp-shaped CAD document, completing the stamping of the CAD document, and publishing the stamped CAD graphics.
[0055] The first step is to stamp the CAD document. The main function of this part is to insert the chapter shape into the original graphics, and decompo...
specific Embodiment approach 3
[0058] Embodiment 3: This embodiment further explains Embodiment 2. The process of stamping the CAD document described in step 2 is: decompose the set chapter blocks, and then load them into the CAD file.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Login to View More
Abstract
The invention discloses a signature watermarksystem used for CAD (Computer-Aided Design) documents, belonging to the field of mechanical drafting. The signature watermarksystem solves the problems that the existing CAD signature system is hard to restore the documents, and an issuer cannot be determined even the document is protected through the joint hands of encrypting and the system. The signature watermark system comprises a signature module, a check module and a restore module, wherein the signature module is used for decomposing the set shape of a signature for embedding the set shape to the original CAD document, then embedding a signature information watermark and a tamper location information watermark for signature, and finally publishing a CAD graph signed; the check module is used for conducting complete checking on the CAD graph received, extracting the signature information of the CAD document for verifying whether the signature of the CAD document is forged nor not, restoring the watermark graph of the CAD document for verifying whether the CAD document is tampered or not, and giving tamper location information when the graph is tampered; and the restore module is used for restoring the CAD document verified by the check process.
Description
technical field [0001] The invention relates to a signature watermark system for CAD documents, which belongs to the field of mechanical drawing. Background technique [0002] At present, CAD engineering drawing software has gradually replaced manual drawing and has become the first choice for architectural design, parts manufacturing, missile and vehicle design and other departments because of its high graphics accuracy, fast drawing speed, and convenient transmission and storage. However, while it brings convenience to engineers and designers, it also poses serious challenges to the security of electronic drawings and the intellectual property rights they carry. During the dissemination of electronic drawings, people can easily and completely copy and modify the original drawings, which is very likely to cause leakage of confidential information, intellectual property disputes and other issues. [0003] CAD drawings are stored in the form of vector graphics, which cannot ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More