Documents that are protected using WordsProcessing could be protected using SHA256, SHA512 and SHA384 algorithms. However these algorithms are currently not supported by RichTextBox. Thus, a document protected via WordsProcessing could not be unprotected in RadRichTextBox and NotSupportedException is thrown. Add support for these three algorithms. Documents protected in MS Word 2013 could not be unprotected in RRTB as well. Exception thrown: Unsupported hashing algorithm: SHA512.