发明公开
EP0629972A2 Method and apparatus for embedding identification codes in printed documents
失效
用于在印刷文件中嵌入Identifizierungskoden方法和装置。
- 专利标题： Method and apparatus for embedding identification codes in printed documents
- 专利标题（中）： 用于在印刷文件中嵌入Identifizierungskoden方法和装置。
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申请号： EP94301256.7申请日： 1994-02-22
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公开(公告)号： EP0629972A2公开(公告)日： 1994-12-21
- 发明人: Mahon, Michael J. , Huck, Jerome C. , Morris, Dale C.
- 申请人： HEWLETT-PACKARD COMPANY
- 申请人地址： 3000 Hanover Street Palo Alto, California 94304-1181 US
- 专利权人： HEWLETT-PACKARD COMPANY
- 当前专利权人： HEWLETT-PACKARD COMPANY
- 当前专利权人地址： 3000 Hanover Street Palo Alto, California 94304-1181 US
- 代理机构： Williams, John Francis
- 优先权： US52253 19930423
- 主分类号： G06K15/02
- IPC分类号： G06K15/02 ; B41M3/14
摘要：
A method and apparatus (1203, 1403) for embedding identification information in documents. The present invention embeds information in each copy of a document (1207, 1407) such that a particular copy of the document is distinguishable from all other copies of the same document. Additionally, this embedded information (1209, 1301, 1409) is designed to remain intact even if the original is copied. A method and apparatus is also disclosed to embed verification information in a printed document (1207, 1407) such that modification to the text subsequent to printing is detectable.
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