The ContentLink webpart works like the SharePoint ContentEditor webpart in ContentLink mode, but does not require you to configure anonymous access. ContentLink is useful for showing common content stored in a central document library for use across different
Use the ContentLink property to set a server relative or absolute URL of the linked content to show. The user must of course have at least read-access to the document library where the linked content is stored. Note that the web-part is not suitable for solution
gallery/sandboxed deployment due to the use of web request.
web-part will work for retrieving linked content from other web-applications and site-collections even if anonymous access is not turned on. It also works when anonymous access is turned on, when the anonymous
web-application policy is "no policy", "deny write" or "deny all". The code use the default credentials of the user when making the web request.