feature_51 disabled message when to preview the doc

[venkata]

I am getting feature_51 disabled message when to preview the doc.
Please suggest about enabling of preview feature without downloading the document by the user

I installed logicaldoc 6.0RC3 in windows 2003 and openoffice2.0 with pdf conversion.
I uploaded the document after converting into pdf and provided the sdirectory permision as read only for the specified group. Now i am able to preview the pdf doc but user can save the file by using right click on the preview and choose save pic as /print as /mail as. I want to disable this features except to preview the doc.
Please suggest.
I want to use open source edition of logical doc with this feature.

[mcaruso]

The feature 'Preview' for Microsoft Office documents is available only for Commercial Edition of LogicalDOC.
In the Community Edition is possible to visualize the first page of Pdf documents.
However is impossible to prevent the user to save the image displayed on the screen.

Best Regards,
Matteo