The DVD-D format was developed by German company FDD Technologies AG, and while no official definition of the D has been offered, many use the abbreviation to mean DVD-Destroy or DVD-Destruct.

Also see "DVD Formats Explained" in the Did You Know...? section of Webopedia.

DVD FAQ
This comprehensive FAQ all about DVDs is updated regularly.

DVD-D limited time play DVD
The new DVD format for movie, video game and software rental.

Webopedia's "Did You Know...?" Section
Use this Webopedia knowledge section for an in-depth overview of specific technologies and occurrences in the areas of Computer Science, The Internet, and Computer Hardware and Software.

Webopedia's Did You Know...DVD Formats Explained
The crucial difference among the standards is based on which standards each manufacturer adheres to. Similar to the old VHS/Beta tape wars when VCRs first hit the markets, different manufacturers support different standards.