You might want to share your video only for a specific period, you can use the "private URL". It allows you to send your video without publishing it. This private URL can have an expiry date if you need it.
To create a private URL, go in your briefcase then on the thumbnail of the video, click on "Modify" in "Private URL".
You can see all private URL you've created on this video. To add a new one, click on "Add a new private URL". You just have to precise the expiry date and a note if you want. Finally, you just have to click "Save".
Once you have created the URL you can send it per e-mail. You just have to copy paste the URL on your navigation bar.