发明名称 System for altering elements of a text file to mark documents
摘要 A system for generating documents. A text file representing a document is encoded using a marking code. This marking code is encoded into the document by altering elements of the contents of the text file. Preferably the spaces between words are altered to be short and long spaces. The marked version therefore indicates, in an encoded fashion, the marking code that is applied.
申请公布号 US5388194(A) 申请公布日期 1995.02.07
申请号 US19900548904 申请日期 1990.07.24
申请人 VOGEL, PETER 发明人 VOGEL, PETER
分类号 B41M3/14;G03C5/08;G06F17/21;G06F21/24;G09C5/00;(IPC1-7):G06F15/62 主分类号 B41M3/14
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