The article presents information on a system design that addresses all technical issues for reliable digital preservation of substantial collections. A compete solution to the problem of digital preservation would ensure the atleast a copy of preserved record survives, and authorized consumers can find and use any preserved record as its producers intend. Viable solutions will allow repositories and their clients to use deployed content management software without disruption. Preservation can be viewed as a special case of information interchange. Perfect digital copying contributes both to the challenge of preserving digital solution and to its solution. The new code needed for digital preservation is likely to be mostly workstation software so the people focusing repositories will find it difficult to design solutions. The Trustworthy Digital Object focuses on methods for making the authenticity of preserved digital objects reliably testable and for assuring that eventual users will be able to render or otherwise use their contents.