It is part of C99 / POSIX. And not used in libaacs ...

Ensure nul termination.

Previously libaacs discarded unit keys when e.g. config file had 1 unit
key and the disc had 2 or more. This is fine when we have VUK or MK+VID
available. However, when VUK is not available, discarding unit key means
that the disc can't be decrypted.

Avoid >100k malloc() + free()

Avoid pointers to freed memory

Makes opening UHD discs ~10 second faster

- add space between string constant and macro literal
- add error checks
- android support
- C++ support

AM_CPPFLAGS is the correct variable to use for preprocessor flags. Importantly, it is placed on the compiler command line before CPPFLAGS, whereas AM_CFLAGS comes after CPPFLAGS. So before this change, it was possible for incorrect headers in external locations to be used instead of the internal ones specified in SET_INCLUDES.

MKB 2.x seems to use record type 0x86 for media key verification data.
However, specifications are not available in the public so this should be
considered experimental.

This enables playback of Bus Encryption Enabled discs even without a
valid Host Certificate when cached RDK is available for current drive/disc
combination.

One cached RDK will only work for one drive/disc combination.