The UKSG Transfer Code of Practice contains voluntary guidelines for publishers involved in journal transfer, and covers such issues as DOI and URL transfer and perpetual access rights to journal content. The Code sets out to meet the need for consistent guidelines to help publishers ensure content is easily accessible to libraries and readers.
The latest version to be released (3.0) covers new types of content, HTTP redirects and more and is now available for public comment. Comments will be considered by the Working Group which will then update the Code of Practice
For more information see the UKSG website.