Some publishers may use copyrighted fonts and obfuscate them in order to protect the rights. Because obfuscated fonts create both a technical and copyright challenge for preservation, open fonts should be used. Font files should also be embedded within the publication they are being used in. This is especially important if the font selection is non-standard or has special characters that are important for the specific presentation of the work. For an EPUB, they should be included in the EPUB package. Similarly, for a website, the font files should be hosted locally as part of the web application rather than depending on an external font provider to support the link over the long term.