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+.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
+
+.. _dvb_ca:
+
+####################
+Digital TV CA Device
+####################
+
+The Digital TV CA device controls the conditional access hardware. It
+can be accessed through ``/dev/dvb/adapter?/ca?``. Data types and ioctl
+definitions can be accessed by including ``linux/dvb/ca.h`` in your
+application.
+
+.. note::
+
+ There are three ioctls at this API that aren't documented:
+ :ref:`CA_GET_MSG`, :ref:`CA_SEND_MSG` and :ref:`CA_SET_DESCR`.
+ Documentation for them are welcome.
+
+.. toctree::
+ :maxdepth: 1
+
+ ca_data_types
+ ca_function_calls
+ ca_high_level