You are responsible for the material you publish on your EngagementHQ site. Be aware that photos, videos, maps, texts, etc are usually protected by copyright and cannot be published on your site without consent from the copyright owner. Before you publish any material, make sure that you have all rights to the content and/or have consent from the copyright owner.
EngagementHQ will not be able to help determine if content is protected and/or can be used on your site.
Also, keep in mind that participant's will not know either. Participant's may upload copyright material in certain tools, e.g. the photos in the story telling tool. Only re-publish the content if you are sure they are the copyright owner or have the rights to publish this content.
If you unsure about anything copyright related, we recommend you check here: http://www.copyright.org.au/