Abstract: Disclosed are database systems and methods of managing them. In one embodiment, a linked data structure is disclosed to enable failure tracking, data integrity and security for the underlying data. The disclosed data structures can embed one or more databases configured to store program instructions, program sub-instructions and mappings designed for failure detection, tracing and restoration of databases to their pre-failure state.

Abstract: Disclosed herein are methods and apparatus for creating an interactive interface allowing a user to create a virtual design on-screen. Specifications of the design created by the user may be subsequently transmitted to a server for high-resolution rendering and printing on an adhesive appliqué or other material adapted to receive print. In some embodiments, the created product is adapted to fit a particular device, such as a cell phone, laptop, personal digital assistant, snowboard, boat, or motor vehicle. Alternatively, the printed product can be adhesively applied to a portion of a wall, a window, or upon the side of a building. In one embodiment, the interactive interface allows the user to create their own personalized product by using a combination of images, colors, text, and shapes, specified for a particular CAD that will print onto an adhesive skin. In this manner, the adhesive skin can be made to look exactly like the finished product of a personally customized design presented on a computer screen.