Some content used in the video clips have been provided by the following:

Videvo Standard License (legacy)

This is a legacy license and has ceased to apply to new Content, however Content originally licensed under this license remains subject to its terms.  Content licensed under the Videvo Standard License may be used free of charge on a Royalty-Free basis. No attribution is required to us, or the named author of the Content. It is strictly forbidden to redistribute this Content in its original form (i.e. for stock purposes) on other websites, blogs, file sharing sites, email or by any other method. 

http://www.videvo.net

Creative Commons 3.0 Unported (CC BY 3.0) License

For Content marked Creative Commons 3.0 Unported (CC BY 3.0) You are free to:

Share, copy and redistribute the Content in any medium or format
Adapt, remix, transform, and build upon the Content for any purpose, even commercially.

The licensor cannot revoke these freedoms as long as you follow the license terms.

You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.

For more information about CC BY 3.0, please refer to https://creativecommons.org/licenses/by/3.0/