Abstract: Conventional file-based engineering design data for an engineering model are represented by a plurality of components. The plurality of components are kept in stores, which reside on servers. Each store contains the components that correspond to the elements of one design file. The stores also maintain a history of changes made to the components. A plurality of client computers are bidirectionally connected to the servers. Each client computer may obtain the current version of the components and may send locally edited versions of the components back to the servers to replace the current versions in the stores. At the client computer, the user interacts with the components using conventional file-based software.

Abstract: Methods and systems for digital rights management are disclosed. Exemplary embodiments of the invention provide a system and method that allows the author of a design file to encrypt the file's contents, so that only authorized users can view the file, and that allows the author to identify specific users for authorization. The author selects the users that are allowed to open the encrypted file. Selected users are called “recipients”. The author then designates the rights granted to the recipients. Preferably, the author identifies users and users are authenticated by means of the user's digital certificates. The author may also have the ability to specify what operations a given user can perform, including view, print/plot, export, copy to clipboard, access history, and edit. An author can also digitally sign a document or file using their digital certificate. A hash value is created for the item to be signed.

Abstract: A bandage to be applied adjacent to an injured portion of a patient's body contains electronic circuitry which delivers electric pulses into the body to block or mask the pain arising from the injury. The bandage includes an inner unit adapted to be applied directly onto the patient's skin and an outer unit adapted to be removably applied upon the inner unit. The inner unit includes spaced apart conductive portions which contact the patient's skin. The outer unit includes a power source and an electronic circuit which applies a voltage output to the conductive portions of the inner unit. The voltage output is transmitted through the conductive portions to the patient's skin to cause low current electrical pulses within the patient's body to block or mask the pain arising from the injury.