You can decide about the rules on who can share content with your corporate library and who has access to see content on your library from the Academy Settings. Simply, click on Admin from the upper navigation bar and select Academy Settings. In the panel that opens, select Advanced Settings.
Under Academy Library you can separately set the rules about who can store content in the Shared Content category and who can read content from it. You can for example give permission only to Admins and Training Managers to store content but give all employees access to it. Content can be either files or web links.