README.txt
1This library (com.android.mediadrm.signer.jar) is a shared java library
2containing classes required by unbundled apps running on devices that use
3the certficate provisioning and private key signing capabilities provided
4by the MediaDrm API.
5
6--- Rules of this library ---
7o This library is effectively a PUBLIC API for unbundled CAST receivers
8 that may be distributed outside the system image. So it MUST BE API STABLE.
9 You can add but not remove. The rules are the same as for the
10 public platform SDK API.
11o This library can see and instantiate internal platform classes, but it must not
12 expose them in any public method (or by extending them via inheritance). This would
13 break clients of the library because they cannot see the internal platform classes.
14
15This library is distributed in the system image, and loaded as
16a shared library. So you can change the implementation, but not
17the interface. In this way it is like framework.jar.
18
19--- Why does this library exist? ---
20
21Unbundled apps cannot use internal platform classes.
22
23This library will eventually be replaced when the provisioned certificate-
24based signing infrastructure that is currently defined in the support library
25is reintegrated with the framework in a new API. That API isn't ready yet so
26this library is a compromise to make new capabilities available to the system
27without exposing the full surface area of the support library.
28
29