While PDFViewer for Silverlight aims to provide a full-featured PDF viewer, it supports a subset of the PDF 1.5 standard and so, like most PDF viewers on the market, does have its limitations. These limitations focus in three areas: encryption, fonts, and images.
Encrypted Files
Encrypted files are not compatible with ComponentOne PdfViewer for Silverlight. At this time C1PdfViewer cannot open or save encrypted files.
Fonts
ComponentOne PdfViewer for Silverlight supports the following font types:
•Embedded TrueType fonts: These are fonts specified using the "FontFile2" mechanism in PDF.
•Silverlight fonts: This includes all font families supported by Silverlight.
•PDF base fonts: This includes fonts built into Adobe Acrobat such as Helvetica, Times, and Symbol.
The C1PdfViewer control does not support other font types available in the PDF specification, including Adobe Type 1 fonts (specified using the "FontFile" mechanism in the PDF file).
The C1PdfViewer control also does not currently support right-to-left languages such as Arabic or Hebrew.
Documents that use non-supported fonts will still render, but the formatting will be incorrect (for example, the document may show overlapping text).
Images
ComponentOne PdfViewer for Silverlight supports most common image types, including all binary stream formats supported by Silverlight as well as deflated streams of several types (RGB, Monochrome, and several common indexed formats).
The C1PdfViewer control does not support some rare formats such as deflated JPG streams, or advanced features such as custom color spaces or halftones. Note that scanned PDF files may contain TIFF data which the C1PdfViewer control is currently not capable of rendering.