Method for embedding and extracting watermark in English texts |
Title： |
| Method for embedding and extracting watermark in English texts |
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Application Number： |
200510077471 |
Application Date： |
2005/06/24 |
Announcement Date： |
2005/11/23 |
Pub. Date： |
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Publication Number： |
1700205 |
Announcement Number： |
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Grant Date： |
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Granted Pub. Date： |
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ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
G06F 17/21, G06F 1/00 |
Applicant(s)： |
Tsinghua University |
Inventor(s)： |
Li Deyi, Wang Jianmin, Ye Xiaojun, Zhang Rongqi, Zhang Zhihao |
Key Words： |
English texts, embed, extract, watermark |
Abstract： |
The invention relates to a method for embedding and extracting water spot from English text in the field of text copyright protection technique. It has the following steps: changing the copyright information into binary bit string, reading in the text and filtering special characters and indent and then operating the character string and copyright person's private key to obtain integer number Z, if Z can divide embedding ratio exactly, the next sentence is water spot information sentence, using Z to do negation with copyright information binary bit string to ascertain the information bit of bided embedding water spot, using Z to do negation with the number of the characters of water spot information sentence to ascertain the location of the water spot information bit so that 0, 1 which can represent the relation of the adjacent alpha codes are uniform with bided embedding water spot information bit until finish text. The process of extracting water spot information is a reverse process of embedding it. |
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PCT： |
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 Relevancy information |
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| Other Patents of Same Inventor |
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| Last Update |
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2008-4-17 |
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Selected patents owned by Tsinghua University filed in 2005 are loaded. |
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2008-3-31 |
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Selected patents owned by Tsinghua University filed in 2006 and 2007 are load. |
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