Ada.ReportingServices.WatermarkPDFRender is a Reporting Services PDF render which adds a watermark text on each page.

Adapt to Different Reporting Services Version

The source code is for Reporting service 2016, version 14.0.
You may change the Reporting service version with

• Change the Reference dlls, Microsoft.ReportingServices.ImageRendering.dll, Microsoft.ReportingServices.Interfaces.dll and Microsoft.ReportingServices.ProcessingCore.dll from your target Reporting Service installation folder. It usually is C:\Program Files\Microsoft SQL Server Reporting Services\SSRS\ReportServer\bin\ .
• Change WatermarkPDFRender.cs, line 29, the Type name of Microsoft.ReportingServices.Rendering.ImageRenderer.PDFRenderer, change the dll version as your target reporting service dll version.

Installation

1. Compile the project, Copy the Ada.ReportingServices.WatermarkPDFRendering.dll into reporing service installation bin folder. Usually, it is C:\Program Files\Microsoft SQL Server Reporting Services\SSRS\ReportServer\bin.

2. Change the rsreportserver.config, comment out the original PDF render <Configuration><Extensions><Render><!--Extension Name="PDF" .../-->
   Add new WatermarkPDFRenderer in <Configuration><Extensions><Render> as below. The watermark text is configured in <DeviceInfo><Watermark> element.

   <Extension Name="PDF" Type="Ada.ReportingServices.WatermarkPDFRendering.WatermarkPDFRenderer,Ada.ReportingServices.WatermarkPDFRendering">
   	<Configuration>
   		<DeviceInfo>
   			<Watermark>Ada.ReportingServices.WatermarkPDFRendering.WatermarkPDFRenderer</Watermark>
   		</DeviceInfo>
   	</Configuration>
   </Extension> 

3. Change rssrvpolicy.config, add following CodeGroup section in the last inner CodeGroup section to grant Ada.ReportingServices.WatermarkPDFRendering.dll full trust.

   <CodeGroup class="UnionCodeGroup" version="1" PermissionSetName="FullTrust" Name="WatermarkPDFRendering" Description="This code group grants Ada.ReportingServices.WatermarkPDFRendering FullTrust. ">
   	<IMembershipCondition class="UrlMembershipCondition" version="1" Url="C:\Program Files\Microsoft SQL Server Reporting Services\SSRS\ReportServer\bin\Ada.ReportingServices.WatermarkPDFRendering.dll"/>
   </CodeGroup>

4. Restart Reporting service, you will see "PDF with Watermark' in the Export options.