We have evaluated dozens of similar commercial/non-commercial libraries as Aspose PDF for .NET and no other product provides good enough SDK which provides clear documentation with examples and stable functionality of editing PDF, such as removing open action / page action and removing attachment. We have tested with many thousands of PDF file with various PDF file formats/versions and results were very convincing. The technical support was so responsive on addressing some issues that we got newer SDK with the fixes of the issues that we encountered during our testing. We are looking forward integrating Aspose PDF and even other products with our product for more functionality. Thank Aspose team for the great support and great product.