The DMCA does more than merely insulate (subject to satisfaction of certain conditions) ISPs and site owners from liability for acts of infringement by third-parties who 'misuse' their network or web-sites. So, for instance, the DMCA makes it illegal to circumvent electronic security devices (with a view to those who would nullify electronic copy-protection devices, such as the DRM) under certain circumstances (which prohibition speaks directly to locking/unlocking questions).