Strange data in Quicktime video captures

[Jethryn Freyman]

I used Quicktime to record video from my iSight. I opened the movie in a hex editor, and found some strange data:

_kMDXXXX___DUMMY_kMDXXXX___DUMMY
public.message
com.apple.mail.emlxcom.microsoft.entourage.virtual.messagepublic.contact
com.apple.addressbook.person.com.apple.addressbook.group
com.microsoft.entourage.virtual.contact
com.microsoft.entourage.virtual.group
com.apple.systempreference.prefpane
public.fontpublic.bookmark
com.apple.safari.bookmark
com.apple.safari.historypublic.to-do-itempublic.calendar-eventcom.apple.ical.bookmarkcom.apple.ical.bookmark.todo
com.microsoft.entourage.virtua

Any ideas why this is in the movie file?