Telerik Reporting supports PDF metadata with a rendering extension setting in the Telerik Reporting config section. More information on configuring the rendering extensions is available in the following articles:
About RadDocument - it offers PDF export through PdfFormatProvider. However, adding such metadata is not supported for now.
We are also considering implementing a PDF viewer for Silverlight, however, due to time constraints, we're not sure exactly when it will be available. Moreover, it is not quite clear yet if it will be possible to persist and edit such metadata.
There is a PITS issue regarding the implementation of a PDF viewer, which you can use to track our development plans and progress:
You can follow the PITS Issue by its ID: 7075
Here you can find the PITS Issue: Public URL
the Telerik team
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