.BPK File Extension

Disc key file created by Nero products, including BackItUp & Burn and Burning ROM; contains a public key that can be used to verify the source and contents of a burned disc; typically distributed by the author of the disc so users can verify that the disc is authentic.

Nero SecurDisc Viewer is an application distributed freely by Nero for verifying SecurDisc contents. The application is included with Nero BackItUp & Burn and Burning ROM, which both are part of the Nero Multimedia Suite.