A video on demand (VOD) method, consistent with the invention involves storing
multiple selective encrypted VOD content on a VOD server; receiving an order for
the VOD content specifying delivery to a target decoder; determining what CA encryption
system is associated with the order; stripping all encrypted segments from the
multiple selectively encrypted content that are not associated with the order to
produce single selectively encrypted VOD content; and sending the single selectively
encrypted VOD content to the target decoder. The multiple selectively encrypted
VOD content can be created by examining unencrypted data representing digital content
to identify segments of content for encryption; encrypting the identified segments
of content using a first encryption method associated with a first conditional
access system to produce first encrypted segments; encrypting the identified segments
of content using a second encryption method associated with a second conditional
access system to produce second encrypted segments; and replacing the identified
segments of content with the first encrypted content and the second encrypted content
in the digital content, to produce the multiple selectively encrypted VOD content.