Silverlight Output Protection

Article
07/09/2010

[Post Updated]

The Silverlight Output Protection information that used to be in this blog post has been updated in the Silverlight Digital Rights Management (DRM) topic on MSDN.

In case you were wondering what Output Protection is:

"The purpose of output protection is to increase content protection during transmission between the video or audio output ports of a computer and the input port of another device, such as a monitor or set of speakers..."

See the Ouput Protection section of the DRM topic for more information.

See Also

It has been brought to our attention that the formatting for the Silverlight output protection table in the Digital Rights Management (DRM) topic is incorrect. This makes the table difficult to read. I'm fixing this on MSDN, but in the mean time here is the table with the correct formatting:

The following table lists the behavior in Silverlight 4 with output protection policies in a PlayReady License.

Policy	Values	Meaning	Windows 7 or Windows Vista	Windows XP	Macintosh
Minimum Analog Video Output Protection Level	100	No Restriction	Play	Play	Play
	150	CGMS-A Best Effort	Enforce	Enforce	Enforce⁴
	200	CGMS-A	Enforce	Enforce	Block
	>=201	Block	Enforce¹	Enforce¹	Enforce¹
Minimum Uncompressed Digital Video Output Protection Level	100	No Restriction	Play	Play	Play
	250	HDCP Best Effort	Enforce	Enforce	Enforce⁴
	270	HDCP Best Effort 520k pixels	Same as HDCP²	Same as HDCP²	Same as HDCP²
	300	HDCP	Enforce	Enforce	Block
	>=301	Block	Enforce	Enforce	Enforce
Minimum Compressed Digital Video Output Protection Level	>=0	Block	Enforce¹	Enforce¹	Enforce¹
Minimum Compressed/Uncompressed Digital Audio Output Protection Level	100	No Restriction	Play	Play	Play
	150	Secure Drivers and Streaming Rendering Applications	Block	Block	Block
	200	Secure Drivers	Block	Block	Block
	250	Secure Drivers and SCMS or HDCP	Block	Block	Block
	300	Secure Drivers and HDCP	Block	Block	Block
	>=301	Block	Enforce¹	Enforce¹	Enforce¹
Explicit Analog Video Output Protection	CGMS-A Output Protection IDs all configuration values (Section 5.6.1 of PlayReady Compliance Rules)	CGMS-A	Enforce	Enforce	Same as CGMS-A³
	Constrained Image Trigger Output Protection ID (Section 5.6.1 of PlayReady Compliance Rules)	Maximum resolution 520k Pixels per frame	Block	Block	Block
	AGC/Color Stripe Output Protection ID all configuration values (Section 5.6.1 of PlayReady compliance Rules)	ACP	Block	Block	Block
Explicit Digital Audio Output Protection	SCMS Output Protection ID all configuration values (Section 3.4.3.7, 3.4.4.7 of PlayReady Compliance Rules)	SCMS	Block	Block	Block

· ¹In this case, it always results in Block

· ²Equivalent to setting the Minimum Uncompressed Digital Video Output Protection Level = 300

· ³Equivalent to setting the Minimum Analog Video Output Protection Level = 200

· ⁴In this case, it results in Play

--Brian

Silverlight Output Protection

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