| 摘要 |
Method of invisibly embedding into a text document generated by a licensed software the License Identification Signature of the software wherein each original copy of the software has been assigned a unique Software License Code (SLC) and a unique License Identification Key (LIK) by a Licensing Authority, such a method comprising the steps of computing a Document Hash Value (DHV) of the text document ( 12 ), getting from the DHV a License Identification Code (LIC) of the text document by using the LUK ( 14 ), and embedding ( 18 ) invisibly into the text document the License Identification Signature (LIS) formed by the SLC, DHV and LIC after the LIS has been encoded by using character attributes.
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