Secure Expired MP3 File can be used for hiding real mp3 link inside html source using base64_encode, mcrypt_encrypt, base64_decode, mcrypt_decrypt and md5. MP3 link will be expired in few seconds then it will return No Access Page to protect MP3 files to hot linked.
I was working on Secured & Expired MP3 Link in HTML5 MP3 Player. Hope you already read previous article “Amazon S3 Expiring Link”
These functions are also useful when you need to secure & expire media links …