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Paper Abstract and Keywords
Presentation 2015-03-12 16:00
Development of dynamical invisible watermarking embedding system for PDF document
Takuya Iwamoto, Masaki Kawamura (Yamaguchi Univ.) EMM2014-90
Abstract (in Japanese) (See Japanese page) 
(in English) We developed dynamical embedding system of invisible digitalwatermarking for PDF documents.The PDF is one of popular document file formats,and then the PDF documents are widely used as business documents.Therefore,the digital watermarking is expected as a tool for identifying unfair user from leaked documents.In our system,documents holder uploads the original PDF document to the system,and then each user is authenticated by own ID.When the authorized user downloads the PDF document from the system,the user ID is dynamically embedded into the document as watermark.The generated stego-PDF documents is effective for countermeasure against unauthorized distribution.In order to embed invisible digital watermark into a PDF document,the watermark is embedded by modifying line-spacing patterns.In the structure of PDF file,lines are placed at specified coordinates by operators.By detecting the coordinate operator,the length of line space can be easily calculated.The lengths of line spaces are aligned with their average lenght,since they are a little different.Three line spaces of each are grouped as a pattern,and then each pattern represents one bit of the watermark.In embedder,watermark bits are embedded by modifying the lengths of line spaces.As a result,our system could embed watermark into PDF documents without a feeling of strangeness.Moreover,the capacity by the proposed method is almost twice as much as one by existing embedding method.
Keyword (in Japanese) (See Japanese page) 
(in English) PDF / digital document / digital watermark / line shift embedding / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 511, EMM2014-90, pp. 79-84, March 2015.
Paper # EMM2014-90 
Date of Issue 2015-03-05 (EMM) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee EMM  
Conference Date 2015-03-12 - 2015-03-13 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
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Paper Information
Registration To EMM 
Conference Code 2015-03-EMM 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Development of dynamical invisible watermarking embedding system for PDF document 
Sub Title (in English)  
Keyword(1) PDF  
Keyword(2) digital document  
Keyword(3) digital watermark  
Keyword(4) line shift embedding  
1st Author's Name Takuya Iwamoto  
1st Author's Affiliation Yamaguchi University (Yamaguchi Univ.)
2nd Author's Name Masaki Kawamura  
2nd Author's Affiliation Yamaguchi University (Yamaguchi Univ.)
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Date Time 2015-03-12 16:00:00 
Presentation Time 90 
Registration for EMM 
Paper # IEICE-EMM2014-90 
Volume (vol) IEICE-114 
Number (no) no.511 
Page pp.79-84 
#Pages IEICE-6 
Date of Issue IEICE-EMM-2015-03-05 

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