Designhill has a Non-Disclosure Agreement, aka NDA, in place. This agreement is usually applicable to private/protected contests between the clients and participants.
The agreement aims to hide a private contest from search engines and prevent designers from submitting/using their designs elsewhere or disclosing details related to a contest.
Since clients on Designhill have the option to upload their own NDA, you may also agree to some other terms.
So, we recommend you read the NDA thoroughly to understand it before giving your consent to it or signing it.