1. The white paper of U.S. National Science Foundation workshop on e-product design and realization for mechanically engineered products, October 19–20, 2000, Pittsburgh, PA, http://www.e-designcenter.info
2. Parunak, H. V. D. , 1997, “Distributed Collaborative Design (DisCollab): An ATP Opportunity,” http://www.mel.nist.gov/msid/groups/edt/ATP/white-paper (Whitepaper of NIST-ATP Workshop: Tools and Technologies for Distributed and Collaborative Design)
3. Adobe DRM, http://www.adobe.co.uk/epaper/features/drm/drmtools.html
4. IBM EMMS, http://www-306.ibm.com/software/data/emms/
5. LockStream, http://www.lockstream.com