Patent 7565551 was granted and assigned to Microsoft on July, 2009 by the United States Patent and Trademark Office.
One or more instructions of software being installed on a computing device are modified to embed a digital signature in the installed software. The installed software is stored on the computing device so that it can be executed on the computing device in a trusted mode if the signature is verified, and so that it can also be executed on the computing device without additional modification in a public mode where the signature is not verified.