Efficient common storage of partially encrypted content

1. A method comprising:

storing a media content item at a media server, the media content including a first media content data, a second media content data, the first media content data comprising one or more non-key frames, the second media content data comprising one or more key frames, wherein storing the media content item includes:

storing only a single copy of the first media content data as unencrypted data,

storing multiple copies of the second media content data as encrypted data, each copy of the multiple copies of the second media content data being a different designated streaming format, and

storing a header in a format that is not specific to any designated streaming format;

receiving at the media server a request from a client device to transmit the media content item via a communications interface, the media content item comprising video data, the media content item being associated with a plurality of streaming formats;

constructing at the media server the requested media content item in a designated streaming format by creating a particular media content item representation, via a processor at the media server, the particular media content item representation created by transforming the stored header that is not specific to any designated streaming format into a format specific to the designated streaming format, and combining the stored one or more non-key frames of the first media content data, the stored one or more key frames of second media content data, and the transformed header;

transmitting the particular media content item representation to the client device via the communications interface for playback; and

storing the constructed requested media content item in cache such that the constructed requested media content item may be transmitted to another client device upon request without separately constructing the representation for each request.

2. The method recited in claim 1 , wherein the particular media content item representation comprises a video content frame.

3. The method recited in claim 1 , wherein the particular media content item representation is specific to the designated streaming format.

4. The method recited in claim 1 , wherein the designated streaming format includes a plurality of unencrypted media content portions, each of the unencrypted media content portions being common to the plurality of streaming formats.

5. The method recited in claim 1 , wherein the designated streaming format includes a plurality of header portions, each of the plurality of header portions being specific to the designated streaming format.

6. The method recited in claim 5 , wherein each of the plurality of header portions is created in response to receiving the request, and wherein each of the plurality of header portions is created based on header data common to the plurality of streaming formats.

7. The method recited in claim 1 , wherein the designated streaming format is selected from the plurality of streaming formats based on a hardware or software capability of the client device.

8. A system comprising:

a processor; and

memory, the memory storing instructions to execute a method, the method comprising:

storing a media content item at a media server, the media content including a first media content data, a second media content data, the first media content data comprising one or more non-key frames, the second media content data comprising one or more key frames, wherein storing the media content item includes:

storing only a single copy of the first media content data as unencrypted data,

storing multiple copies of the second media content data as encrypted data, each copy of the multiple copies of the second media content data being a different designated streaming format, and

storing a header in a format that is not specific to any designated streaming format;

receiving at the media server a request from a client device to transmit the media content item via a communications interface, the media content item comprising video data, the media content item being associated with a plurality of streaming formats;

constructing at the media server the requested media content item in a designated streaming format by creating a particular media content item representation, via a processor at the media server, the particular media content item representation created by transforming the stored header that is not specific to any designated streaming format into a format specific to the designated streaming format, and combining the stored one or more non-key frames of the first media content data, the stored one or more key frames of second media content data, and the transformed header;

transmitting the particular media content item representation to the client device via the communications interface for playback; and

storing the constructed requested media content item in cache such that the constructed requested media content item may be transmitted to another client device upon request without separately constructing the representation for each request.

9. The system recited in claim 8 , wherein the particular media content item representation comprises a video content frame.

10. The system recited in claim 8 , wherein the particular media content item representation is specific to the designated streaming format.

11. The system recited in claim 8 , wherein the designated streaming format includes a plurality of unencrypted media content portions, each of the unencrypted media content portions being common to the plurality of streaming formats.

12. The system recited in claim 8 , wherein the designated streaming format includes a plurality of header portions, each of the plurality of header portions being specific to the designated streaming format.

13. The system recited in claim 12 , wherein each of the plurality of header portions is created in response to receiving the request, and wherein each of the plurality of header portions is created based on header data common to the plurality of streaming formats.

14. The system recited in claim 8 , wherein the designated streaming format is selected from the plurality of streaming formats based on a hardware or software capability of the client device.

15. One or more non-transitory computer readable medium having instructions stored thereon for performing a method, the method comprising:

storing a media content item at a media server, the media content including a first media content data, a second media content data, the first media content data comprising one or more non-key frames, the second media content data comprising one or more key frames, wherein storing the media content item includes:

storing only a single copy of the first media content data as unencrypted data,

storing multiple copies of the second media content data as encrypted data, each copy of the multiple copies of the second media content data being a different designated streaming format, and

storing a header in a format that is not specific to any designated streaming format;

receiving at the media server a request from a client device to transmit the media content item via a communications interface, the media content item comprising video data, the media content item being associated with a plurality of streaming formats;

constructing at the media server the requested media content item in a designated streaming format by creating a particular media content item representation, via a processor at the media server, the particular media content item representation created by transforming the stored header that is not specific to any designated streaming format into a format specific to the designated streaming format, and combining the stored one or more non-key frames of the first media content data, the stored one or more key frames of second media content data, and the transformed header;

transmitting the particular media content item representation to the client device via the communications interface for playback; and

storing the constructed requested media content item in cache such that the constructed requested media content item may be transmitted to another client device upon request without separately constructing the representation for each request.

16. The non-transitory computer readable medium recited in claim 15 , wherein the particular media content item representation comprises a video content frame.

17. The non-transitory computer readable medium recited in claim 15 , wherein the particular media content item representation is specific to the designated streaming format.

18. The non-transitory computer readable medium recited in claim 15 , wherein the designated streaming format includes a plurality of unencrypted media content portions, each of the unencrypted media content portions being common to the plurality of streaming formats.

19. The non-transitory computer readable medium recited in claim 15 , wherein the designated streaming format includes a plurality of header portions,

each of the plurality of header portions being specific to the designated streaming format.

20. The non-transitory computer readable medium recited in claim 19 , wherein each of the plurality of header portions is created in response to receiving the request, and wherein each of the plurality of header portions is created based on header data common to the plurality of streaming formats.