公开(公告)号：GB2344666A

公开(公告)日：2000-06-14

申请号：GB9921762

申请日：1999-09-16

Applicant: IBM

Inventor： HIRAYAMA YUKI ,  AMANO TOMIO ,  SHIMIZU SCHUICHI ,  MORIMOTO NORISHIGE

IPC: G06F12/14 ,  G06F17/21 ,  G06F21/24 ,  G06T1/00 ,  G06T11/60 ,  G06F1/00

Abstract: Embedding information, particularly electronic watermark information, in document data that includes text and is written in a page/content description language. A sequence of locations where the information is to be embedded is generated, based on an analysis of the layout of the document data and using a string of sequential pseudo-random numbers (Figs. 1 and 7). The embedded information can comprise a change in pitch between two designated characters and their succeeding characters (Fig. 3). Alternative, more "robust" watermarks are also described. In one (Fig. 9), a page description that represents either a relative distance travelled from a reference point of a string of characters in which the information is to be embedded, or a relative distance travelled from a reference point of the previous character, is changed: an "equalization attack" destroys the watermark information but also damages the document appearance (Fig. 4). In another, a "compound font" can be used in the page description to replace one or more characters (Figs 5 and 10). Alternatively, the page description data is changed so that a graphic primitive is used to replace a selected character (Figs. 6 and 11).

公开(公告)号：GB2344666B

公开(公告)日：2003-04-02

申请号：GB9921762

申请日：1999-09-16

Applicant: IBM

Inventor： HIRAYAMA YUKI ,  AMANO TOMIO ,  SHIMIZU SHUHICHI ,  MORIMOTO NORISHIGE

IPC: G06F12/14 ,  G06F17/21 ,  G06F21/24 ,  G06T1/00 ,  G06T11/60 ,  G06F1/00

Abstract: A method and a system for embedding information in document data that include text written in a page description language. First, an analysis is made of the layout of the document data in which information is to be embedded. Then, based on the analysis of the layout, a sequence of locations is generated whereat the information is to be embedded. A page description of the text at a determined location is changed in accordance with the embedded information. As a result, the information is embedded in document data that include text written in a page description language. The sequence of locations is generated by producing a string of sequential pseudo-random numbers.

公开(公告)号：CA2157972A1

公开(公告)日：1996-03-17

申请号：CA2157972

申请日：1995-09-11

Applicant: IBM

Inventor： YAMASHITA AKIO ,  HIRAYAMA YUKI

IPC: G06F3/048 ,  G06F3/14 ,  G06F17/21 ,  G06F17/24 ,  G06Q10/10 ,  G06T11/80 ,  G06F17/30 ,  G06F15/163

Abstract: A technique to make it possible to paste text display data in a text-editing program, which is arranged in table format and not formed into a geometrical format, onto a table region of a spreadsheet program as normal cell data by providing a table-format converte r for processing data that is sent to a clipboard or transferred to a spreadsheet program by DDE. The table-format data converter converts data to a format reflecting a table structure such as a C SV format by detecting the ruled-line data or spaces between columns of a table of the text-editing program.