الفهرس 
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Abstract
The IIlll1lher or ndworked users has increased r:tpidly wilh the widespread proliferalion of computers and networks. If the Internct is any inJiL:alion, the number of people who have started using online services has increased dramatically in recent years. The number of /1I/(’I”I/(’1 hrlsls, i.e., 111:1\’hilll’S Ihal h:I\’(, dir(’(’lcPIIIIlTtivily i~; p,rmvil1p’ eXI1l1I1l’l1lially. There:ll’c
1any more which connect to the I nternet indirectly through intermediary services.
Two types of users can be round on the Internet: searchers for information and content 7Ithlishers. Two related problems arise for both users, which arc: the Dllplicale Deleelion in nformation Retrieval or Information Dissemination Systems problem, and the Copy uaranlees for Digital Publishers problem.
The work in this thesis is motivated by the need for a new COpy Detection Approach that an be used to solve both of the previous two problems and can give accurate results, i.e.,
mall values ror hoth or the/itls!’ n!’gllli\’e (’I’/’(}r and the/itlse positive error. We mean by the aIse negative error: the documents that the Copy Detection System missed by not reporting hem as copies although they arc copies, and by the raise positive error: the documents that Ire I:llse alerts 10 till: sysklll hy dl’ll’l:lil1[’. 1 Ill: 1 11 a:; copks although thcy arl: Jlot copies.
A new approach is proposed, implemented and tested with respect to accuracy and normance issues. Seveni! experiments will be made and the results will be compared to the suits of the previous work in this field .