Dark item

Items on Internet Archive can be made unavailable for downloading. When an item has been made dark, the data it holds is not deleted, so an item can be restored later.

Reasons
Two reasons are the main cause for an item to be made dark, either a violation of the Terms of Service or the item being a test item and possibly being in the test collection.

Violation of ToS
Violation of the Terms of Service happens mostly for users that are not directly affiliated to the Internet Archive. Violations include:
 * DMCA
 * TODO

Other
Another reason an item can be made dark is because the data in the item is bad or invalid. This usually happens in case of automated recording projects. During this projects a possibility exists of gathering bad data, for example in case the source stream is down or is transmitting bad data. In this case the item with the bad data can be made dark, so the bad data is made unaccessible.