The problem I see with Enliven is that the recipients need to download and install the player. In the corporate networks most users are restricted from upgrading and installing software. Software installation, even viewers, need approval from the department head and IT department head to insure software conflicts don't arise or misuse of bandwidth. To conserve corporate bandwidth many companies have stripped out the most common multimedia codecs (video) allowing basically audio only. In working on corporate projects I have found a work around by using Adobe Acrobat which all networks (so far) include as a standard tool.