PDFs can include many types of movie and sound files, including (but not limited to) Flash, QuickTime, mp3, MPEG, and Windows Media files. These files may be accessed on a page or within a link, bookmark, form field, or page action. Each movie and sound file includes a play area from which the media can be activated. The play area typically appears on the PDF page as an image or a rectangle, but can also be invisible.
To
help protect your computer from viruses, Acrobat solicits
your approval before playing multimedia files from unverified sources.
You can change this default behavior in the Multimedia Trust preferences.
Using the Hand tool or the Select tool, click
the play area of the movie or sound file. When the pointer is positioned
over the play area, it changes to the play mode icon
.