I recently finished authoring a DVD for sale and since the audio was rendered to .ac3, I thought I'd try going through the process of obtaining an agreement with Dolby to use the Dolby Digital logo on the DVD itself and the packaging artwork. Well, it's a slow process, but easy and FREE. Meaning, you do NOT have to pay royalties EVER to use Dolby's logo. You need an agreement and need to follow some specific guidelines. However, if I wanted to do the same thing for another DVD I produce, I have to go through the process again (but it may be a little faster since I now have an agreement on file with Dolby).

Here's how it went.
1. Submit a request for a Trademark Standard Agreement at www.dolby.com.
2. They send two hard copies of the agreement to you (that took them about 3 weeks - I just had to wait.).
3. I sent back both copies of the agreement after signing them, along with a sample copy of the DVD - they check the audio.
4. They then (quickly) emailed me the .eps file of the Dolby Digital logo to create the artwork, which included a pdf file of the proper placement and use guidelines.
5. I now have to send a final copy of the DVD and packaging to Dolby just so they can look it over.

You can also do a quick agreement on their site to use the Dolby logo on your website. That only took about 10 minutes and is a separate process/agreement.

Not that I'm advertising, but here is my website (Sony, feel free to edit my post if this is not allowed):

www.prairiedogpictures.com

Dan