A method and apparatus for processing digital rights managements (DRM)
contents having advertisement (AD) contents attached thereto in a DRM
system are disclosed. When DRM contents including AD contents are
selected by a DRM device, a rights issuer (RI) receives the AD contents
and the DRM contents from a contents issuer (CI), generates a multipart
contents format file, and downloads it to the DRM device. Then, the DRM
device decodes the downloaded multipart contents format file to check
whether the multipart contents format file includes AD contents-attached
DRM contents, and if so, the DRM device reproduces the AD contents to use
the DRM contents free of cost. Thus, the DRM contents can be provided to
a user by using the AD contents without causing a burden of a charge.