17. The machine-readable medium of claim 16 , wherein a location indicator associated with the multimedia annotation is placed on the first multimedia document, wherein the location indicator indicates where the multimedia annotation can be retrieved and played.
18. The machine-readable medium of claim 17 , wherein the location indicator comprises a first Uniform Resource Locator (URL) indicated in plain text, wherein the first multimedia document includes a second bar code, and wherein the second bar code represents the first URL in an encrypted form.