You want to keep your repository free of duplicate documents? This small application can help you with the task. The application detects duplicate documents when they are uploaded and moves them to a duplicate folder. Using standard KM subscription on the duplicate folder a user can get notifications whenever a duplicate has been uploaded. The duplicate detection is based on comparing the hash values of documents.
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The SDN Article can be downloaded as PDF from the link above.
There is a Portal Archive (PAR) attached to the PDF document. Please use a recent version of Adobe Acrobat Reader to access the attachment according to the screenshot below. The PAR file also contains the source code.