Custom Craft CMS plugins from Masuga Design.
Link Vault for Craft CMS
Link Vault for Craft CMS allows you to protect your local and external Assets download links, track all downloads and track leech attempts.
Link Vault for ExpressionEngine
Link Vault for ExpressionEngine allows you to protect your local and external download links, track all downloads, track leech attempts, track hack attempts and protect any other links you’d like to hide.