Untangling copyright issues also presents a significant challenge for digital preservation projects. A non-video game example is the BBC Domesday Project. In addition to the individual copyrights of the estimated 1 million people who took part in the project, there are also copyright issues that relate to the technologies employed. It is likely that the Domesday Project will not be completely free of copyright restrictions until at least 2090, unless copyright laws are revised for earlier expiration of software into the public domain.