Libraries are working to digitize orphan works, or copyrighted works whose owners cannot be located, but there are challenges. They are developing best practices to reasonably search for copyright owners before displaying orphan works with a special notice. While copyright law applies to online content, implied licenses for internet posting are vague. Fair use allows limited use of copyrighted works without permission, but its application is changing as copyright owners make rights easier to obtain through collective licensing. Individuals can be liable for copyright infringement for unauthorized copying and distribution.