The DAVID consortium has released State of the Art Report on Damage Prevention and Repair of Digital AV Media.
Here's an excerpt:
This report contains information on the state of the art in digital damage prevention and repair of audio-visual media. It has been compiled in course of the project definition of DAVID. The DAVID project addresses specific research questions for preservation and restoration of audio-visual media. An overview on the projects rationale is presented in section 2, details on the continuing project can be found at www.david-preservation.eu.