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for invention","granted":false,"earliest_filing_date":"2009-09-08","application_expiry_date":"2012-06-15","has_disclaimer":false,"patent_status":"DISCONTINUED","publication_count":1,"has_spc":false,"has_grant_event":false,"has_entry_into_national_phase":false},"abstract":{"en":[{"text":"In one embodiment the present invention includes a system and method of distributing content. Authorization information is encoded with the content. When received and decoded, if a particular device output is authorized by the authorization information, then the content is output. By encoding the authorization information along with the content, unauthorized display of the content is reduced.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"}]},"abstract_lang":["en"],"has_abstract":true,"claim":{"en":[{"text":"1 . A method of distributing content, comprising: associating at least one authorized display mode with the content; generating a transport stream that includes the content and the at least one authorized display mode; encoding the transport stream; transmitting, by a first device, the transport stream having been encoded; receiving, by a second device, at least one device display mode; decoding the transport stream to generate the content and the at least one authorized display mode; comparing the at least one device display mode and the at least one authorized display mode; and outputting the content according to a result of the comparing.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"2 . The method of claim 1 , wherein the content comprises video on demand content.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"3 . The method of claim 1 , wherein associating the at least one authorized display mode comprises: associating at least one authorized display mode with the content using extensible markup language (XML) metadata.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"4 . The method of claim 1 , wherein the transport stream corresponds to an MPEG-2 (moving pictures experts group) format that includes the content in a video portion and that includes the at least one authorized display mode in an ECM (entitlement control message) portion.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"5 . The method of claim 1 , wherein the at least one device display mode corresponds to a high definition multimedia interface and a high-bandwidth digital content protection standard.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"6 . The method of claim 1 , wherein the at least one device display mode corresponds to a high definition multimedia interface and a digital video interface standard.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"7 . The method of claim 1 , wherein the content is output when the at least one authorized display mode corresponds to the at least one device display mode.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"8 . A device for displaying content, comprising: a decoder that receives an encoded transport stream, wherein the encoded transport stream includes the content and at least one authorized display mode, and that decodes the transport stream to generate the content and the at least one authorized display mode; a conditional access system, coupled to the decoder, that receives at least one device display mode, that compares the at least one device display mode and the at least one authorized display mode, and that outputs a control signal; and an output, coupled to the decoder and to the conditional access system, that outputs the content according to the control signal.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"9 . The device of claim 8 , further comprising: a demodulator that receives a modulated, multiplexed, encoded transport stream and that generates a multiplexed, encoded transport stream; and a demultiplexer that receives the multiplexed, encoded transport stream and that generates the encoded transport stream.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"10 . The device of claim 8 , wherein the at least one device display mode corresponds to a display device coupled to the conditional access system.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"11 . The device of claim 8 , wherein the at least one device display mode corresponds to a display device coupled to the conditional access system via a high definition multimedia interface and a high-bandwidth digital content protection standard.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"12 . The device of claim 8 , wherein the at least one device display mode corresponds to a display device coupled to the conditional access system via a high definition multimedia interface and a digital video interface standard.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"13 . The device of claim 8 , wherein the content is output when the at least one authorized display mode corresponds to the at least one device display mode.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"14 . A method of displaying content, comprising: receiving an encoded transport stream, wherein the encoded transport stream includes the content and at least one authorized display mode; receiving at least one device display mode; decoding the transport stream to generate the content and the at least one authorized display mode; comparing the at least one device display mode and the at least one authorized display mode; and outputting the content according to a result of the comparing.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"15 . The method of claim 14 , wherein the at least one device display mode corresponds to a high definition multimedia interface and a high-bandwidth digital content protection standard.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"16 . The method of claim 14 , wherein the at least one device display mode corresponds to a high definition multimedia interface and a digital video interface standard.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"17 . The method of claim 14 , wherein the content is output when the at least one authorized display mode corresponds to the at least one device display mode.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"18 . A system for distributing content, comprising: a distribution device that associates at least one authorized display mode with the content, that generates a transport stream that includes the content and the at least one authorized display mode, that encodes the transport stream, and that transmits the transport stream having been encoded; and a receiver device that receives at least one device display mode, that decodes the transport stream to generate the content and the at least one authorized display mode, that compares the at least one device display mode and the at least one authorized display mode, and that outputs the content according to a result of the comparing.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"19 . The system of claim 18 , further comprising: a display device, having associated therewith the at least one device display mode, that communicates the at least one device display mode to the receiver device.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"20 . The system of claim 18 , wherein the receiver device outputs the content when the at least one authorized display mode corresponds to the at least one device display mode.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"}]},"claim_lang":["en"],"has_claim":true,"description":{"en":{"text":"CROSS REFERENCE TO RELATED APPLICATIONS This application claims priority to U.S. Provisional Patent Application No. 61/097,796, filed 17 Sep. 2008, hereby incorporated by reference in its entirety. BACKGROUND The present invention relates to enabling content output, and in particular, to generating and embedding access codes into content data for controlling the output of the content. Unless otherwise indicated herein, the approaches described in this section are not prior art to the claims in this application and are not admitted to be prior art by inclusion in this section. Content (such as television programs, music and movies) is often distributed in a broadcast manner. The content may be encrypted (also referred to as scrambled), so that only authorized devices may display the content. However, once the decryption (also referred to as descrambling) has occurred, the content is no longer protected and may be further distributed in an unauthorized manner. Furthermore, there are several devices on the market (such as VCR and DVD recorders) that allow analog copies to be made easily. The analog port on a set top box may allow content to escape to a VCR via an analog hole. SUMMARY Embodiments of the present invention are directed to improving security when displaying content. In one embodiment the present invention includes a method of distributing content. The method includes associating an authorized display mode with the content. The method further includes generating a transport stream that includes the content and the authorized display mode. The method further includes encoding the transport stream. The method further includes transmitting, by a first device, the transport stream having been encoded. The method further includes receiving, by a second device, a device display mode. The method further includes decoding the transport stream to generate the content and the authorized display mode. The method further includes comparing the device display mode and the authorized display mode. The method further includes outputting the content according to a result of the comparing. In this manner, the authorized display mode is protected via encoding as is the content. According to an embodiment of the present invention, the above method is implemented by a content distribution system. According to an embodiment of the present invention, a receiver device includes a decoder, a conditional access system, and an output. The decoder receives an encoded transport stream. The encoded transport stream includes the content and an authorized display mode. The decoder decodes the transport stream to generate the content and the authorized display mode. The conditional access system is coupled to the decoder and receives a device display mode. The conditional access system compares the device display mode and the authorized display mode, and outputs a control signal. The output is coupled to the decoder and to the conditional access system, and outputs the content according to the control signal. The following detailed description and accompanying drawings provide a better understanding of the nature and advantages of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a content distribution system according to an embodiment of the present invention. FIG. 2 is block diagram of the distribution device (see FIG. 1 ) according to an embodiment of the present invention. FIG. 3 illustrates an example of a transport stream according to an embodiment of the present invention. FIG. 4 is a block diagram showing details of the receiver device (see FIG. 1 ) according to an embodiment of the present invention. FIG. 5 is a flow diagram of a method of distributing content according to an embodiment of the present invention. DETAILED DESCRIPTION Described herein are techniques for enabling content output. In the following description, for purposes of explanation, numerous examples and specific details are set forth in order to provide a thorough understanding of the present invention. It will be evident, however, to one skilled in the art that the present invention as defined by the claims may include some or all of the features in these examples alone or in combination with other features described below, and may further include modifications and equivalents of the features and concepts described herein. Various method and processes are described below. That they are described in a certain order is mainly for ease of presentation. It is to be understood that particular steps may be performed in other orders or in parallel as desired according to various implementations. When a particular step must precede or follow another, such will be pointed out specifically when not evident from the context. In the following description, the terms “encoding”, “encoder”, “encryption”, “encrypting”, “scrambling”, and related forms thereof, are used. It is intended that these terms are interchangeable. Similarly the terms “decoding”, “decoder”, “decryption”, “decrypting”, “descrambling”, and related forms thereof, are intended to be interchangeable. In the following description, the term “content” is used. In general, content refers to digital information such as picture data, video data (including video on demand), and audio data. In general, content may be distributed via physical copies (such as compact disks, video disks and hard disks) and via transmission (such as radio signals, satellite signals, and computer network data). In general, content is subject to copyright (e.g., an original work of authorship fixed in a tangible form of expression). FIG. 1 is a block diagram of a content distribution system 100 according to an embodiment of the present invention. The content distribution system 100 includes a distribution device 102 , a receiver device 104 , and a display device 106 . A communications channel 108 connects the distribution device 102 and the receiver device 104 . The distribution device 102 receives content 120 and generates packaged content 122 . The content 120 is the original content, for example, a high definition video. The packaged content 122 includes the content 120 and information identifying the authorized display modes for the content 120 . The distribution device 102 encodes the packaged content 122 as part of the packaging process. The specifics of the packaging process performed by the distribution device 102 are provided in more detail below. The communications channel 108 provides the packaged content 122 from the distribution device 102 to the receiver device 104 . The communications channel 108 may be the airwaves (for television broadcasts or satellite broadcasts), a cable network (for cable television signals), the internet (for internet video), etc., depending upon the specific technology implemented in the distribution device 102 and the receiver device 104 . The receiver device 104 receives the packaged content 122 and generates authorized content 124 , if so indicated by device display mode information 126 . The device display mode information 126 indicates the display attributes of the display device 106 to the receiver device 104 . The receiver device 104 decodes the packaged content and generates the authorized content 124 when the device display mode information 126 indicates a match with the authorized display mode information. Alternatively, the matching of the device display mode information 126 and the authorized display mode information may be used as part of the decoding process. That is, if the display device 106 includes a display mode corresponding to the authorized display modes, the receiver device 104 successfully decodes the packaged content 122 . If the display device 106 does not include a display mode corresponding to the authorized display modes, then the receiver device 104 fails to successfully decode the packaged content 122 . The display device 106 displays the authorized content 124 when the receiver device 104 successfully decodes the packaged content 122 . When the receiver device 104 fails to successfully decodes the packaged content 122 , for example when the display device 106 does not include an authorized display mode, the display device 106 may display an error message. The display device 106 may be a television, a high-definition television, a mobile device such as a cellular telephone, a hand held video device such as an iPod™, etc. The display device may include one or more display modes, including SCART, composite component, RGB, PC, HDMI, DVI, HDCP/HDMI, HDCP/DVI, etc. For example, consider the following configuration. The content 120 is a high definition movie that the content owner would like to distribute to devices authorized according to the HDMI/HDCP standard (high definition multimedia interface/high-bandwidth digital content protection). The distribution device 102 is a cable headend. The cable headend adds the HDMI/HDCP information as the device display mode information 126 to the content 120 , performs encryption, and outputs the packaged content 122 . The receiver device 104 is a set-top box, and the display device 106 is a television; both are connected via HDMI using HDCP. The key contained in the ECM/EMM packets is used by the set top box to decrypt the encoded video. The video is then decoded and encrypted to be sent on the HDMI/HDCP link. The HDMI receiver in the television then decrypts the video and displays it. FIG. 2 is block diagram of the distribution device 102 (see FIG. 1 ) according to an embodiment of the present invention. The distribution device 102 includes a cable headend 202 and a metadata interface device 204 . The cable headend 202 includes the equipment involved in receiving and distributing content, as well as associated systems 214 (power supply, control, etc.), which for conciseness are not detailed. Reception equipment 210 may include satellite downlink equipment, broadcast reception antennas, microwave antennas, communications network equipment, internet connection equipment, fiber optic equipment, and associated demodulation or demultiplexing equipment. Distribution equipment 212 may include security authority systems, router devices, modulator devices and multiplexing devices. The metadata interface device 204 may be part of the control system for the cable headend 202 . The metadata interface device 204 may be a computer that executes a control program for managing metadata related to the content, as more fully detailed below. The metadata interface device 204 may include input components, output components, communication components, processing components, and storage components, as well as associated components (power supply, device interfaces, buses, etc.), which for conciseness are not detailed. The input components may include a keyboard, mouse, trackball, and touch screen. The output components may include a display screen and speaker. The communication components may include a modem, a network interface, a universal serial bus interface, and a wireless interface. The processing components may include one or more microprocessors and device controllers. The storage components may include memory devices (ROM, RAM, DRAM, SRAM, Flash memory, etc.), fixed storage devices (hard disk drives, etc.), and removable storage devices (DVD drives, CD-ROM drives, etc.). The metadata interface device 204 implements features that allow the authorized display mode information to be associated with a particular piece of content. According to an embodiment, the content is a digital data file, and the authorized display mode information is metadata associated with the digital data file. The metadata may be formatted in a variety of ways, including the XML (extensible markup language) format. According to an embodiment, the metadata may be formatted according to “ADI 2.0 Specification Asset Structure”, MD-SP-ADI2.0-AS-103-070105, by Cable Television Laboratories, Inc., Louisville, Colo. An example of metadata formatted according to the ADI 2.0 specification is as follows:
associating at least one authorized display mode with the content;\n
generating a transport stream that includes the content and the at least one authorized display mode;\n
encoding the transport stream;\n
transmitting, by a first device, the transport stream having been encoded;\n
receiving, by a second device, at least one device display mode;\n
decoding the transport stream to generate the content and the at least one authorized display mode;\n
comparing the at least one device display mode and the at least one authorized display mode; and\n
outputting the content according to a result of the comparing."],"number":1,"annotation":false,"title":false,"claim":true},{"lines":["The method of claim 1, wherein the content comprises video on demand content."],"number":2,"annotation":false,"title":false,"claim":true},{"lines":["The method of claim 1, wherein associating the at least one authorized display mode comprises:\n
associating at least one authorized display mode with the content using extensible markup language (XML) metadata."],"number":3,"annotation":false,"title":false,"claim":true},{"lines":["The method of claim 1, wherein the transport stream corresponds to an MPEG-2 (moving pictures experts group) format that includes the content in a video portion and that includes the at least one authorized display mode in an ECM (entitlement control message) portion."],"number":4,"annotation":false,"title":false,"claim":true},{"lines":["The method of claim 1, wherein the at least one device display mode corresponds to a high definition multimedia interface and a high-bandwidth digital content protection standard."],"number":5,"annotation":false,"title":false,"claim":true},{"lines":["The method of claim 1, wherein the at least one device display mode corresponds to a high definition multimedia interface and a digital video interface standard."],"number":6,"annotation":false,"title":false,"claim":true},{"lines":["The method of claim 1, wherein the content is output when the at least one authorized display mode corresponds to the at least one device display mode."],"number":7,"annotation":false,"title":false,"claim":true},{"lines":["A device for displaying content, comprising:\n
a decoder that receives an encoded transport stream, wherein the encoded transport stream includes the content and at least one authorized display mode, and that decodes the transport stream to generate the content and the at least one authorized display mode;\n
a conditional access system, coupled to the decoder, that receives at least one device display mode, that compares the at least one device display mode and the at least one authorized display mode, and that outputs a control signal; and\n
an output, coupled to the decoder and to the conditional access system, that outputs the content according to the control signal."],"number":8,"annotation":false,"title":false,"claim":true},{"lines":["The device of claim 8, further comprising:\n
a demodulator that receives a modulated, multiplexed, encoded transport stream and that generates a multiplexed, encoded transport stream; and\n
a demultiplexer that receives the multiplexed, encoded transport stream and that generates the encoded transport stream."],"number":9,"annotation":false,"title":false,"claim":true},{"lines":["The device of claim 8, wherein the at least one device display mode corresponds to a display device coupled to the conditional access system."],"number":10,"annotation":false,"title":false,"claim":true},{"lines":["The device of claim 8, wherein the at least one device display mode corresponds to a display device coupled to the conditional access system via a high definition multimedia interface and a high-bandwidth digital content protection standard."],"number":11,"annotation":false,"title":false,"claim":true},{"lines":["The device of claim 8, wherein the at least one device display mode corresponds to a display device coupled to the conditional access system via a high definition multimedia interface and a digital video interface standard."],"number":12,"annotation":false,"title":false,"claim":true},{"lines":["The device of claim 8, wherein the content is output when the at least one authorized display mode corresponds to the at least one device display mode."],"number":13,"annotation":false,"title":false,"claim":true},{"lines":["A method of displaying content, comprising:\n
receiving an encoded transport stream, wherein the encoded transport stream includes the content and at least one authorized display mode;\n
receiving at least one device display mode;\n
decoding the transport stream to generate the content and the at least one authorized display mode;\n
comparing the at least one device display mode and the at least one authorized display mode; and\n
outputting the content according to a result of the comparing."],"number":14,"annotation":false,"title":false,"claim":true},{"lines":["The method of claim 14, wherein the at least one device display mode corresponds to a high definition multimedia interface and a high-bandwidth digital content protection standard."],"number":15,"annotation":false,"title":false,"claim":true},{"lines":["The method of claim 14, wherein the at least one device display mode corresponds to a high definition multimedia interface and a digital video interface standard."],"number":16,"annotation":false,"title":false,"claim":true},{"lines":["The method of claim 14, wherein the content is output when the at least one authorized display mode corresponds to the at least one device display mode."],"number":17,"annotation":false,"title":false,"claim":true},{"lines":["A system for distributing content, comprising:\n
a distribution device that associates at least one authorized display mode with the content, that generates a transport stream that includes the content and the at least one authorized display mode, that encodes the transport stream, and that transmits the transport stream having been encoded; and\n
a receiver device that receives at least one device display mode, that decodes the transport stream to generate the content and the at least one authorized display mode, that compares the at least one device display mode and the at least one authorized display mode, and that outputs the content according to a result of the comparing."],"number":18,"annotation":false,"title":false,"claim":true},{"lines":["The system of claim 18, further comprising:\n
a display device, having associated therewith the at least one device display mode, that communicates the at least one device display mode to the receiver device."],"number":19,"annotation":false,"title":false,"claim":true},{"lines":["The system of claim 18, wherein the receiver device outputs the content when the at least one authorized display mode corresponds to the at least one device display mode."],"number":20,"annotation":false,"title":false,"claim":true}]}},"filters":{"npl":[],"notNpl":[],"applicant":[],"notApplicant":[],"inventor":[],"notInventor":[],"owner":[],"notOwner":[],"tags":[],"dates":[],"types":[],"notTypes":[],"j":[],"notJ":[],"fj":[],"notFj":[],"classIpcr":[],"notClassIpcr":[],"classNat":[],"notClassNat":[],"classCpc":[],"notClassCpc":[],"so":[],"notSo":[],"sat":[]},"sequenceFilters":{"s":"SEQIDNO","d":"ASCENDING","p":0,"n":10,"sp":[],"si":[],"len":[],"t":[],"loc":[]}}