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diff --git a/ogg/doc/rfc3533.txt b/ogg/doc/rfc3533.txt new file mode 100644 index 0000000..f2fcd1a --- /dev/null +++ b/ogg/doc/rfc3533.txt @@ -0,0 +1,843 @@ + + + + + + +Network Working Group S. Pfeiffer +Request for Comments: 3533 CSIRO +Category: Informational May 2003 + + + The Ogg Encapsulation Format Version 0 + +Status of this Memo + + This memo provides information for the Internet community. It does + not specify an Internet standard of any kind. Distribution of this + memo is unlimited. + +Copyright Notice + + Copyright (C) The Internet Society (2003). All Rights Reserved. + +Abstract + + This document describes the Ogg bitstream format version 0, which is + a general, freely-available encapsulation format for media streams. + It is able to encapsulate any kind and number of video and audio + encoding formats as well as other data streams in a single bitstream. + +Terminology + + The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", + "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this + document are to be interpreted as described in BCP 14, RFC 2119 [2]. + +Table of Contents + + 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2 + 2. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 2 + 3. Requirements for a generic encapsulation format . . . . . . . 3 + 4. The Ogg bitstream format . . . . . . . . . . . . . . . . . . . 3 + 5. The encapsulation process . . . . . . . . . . . . . . . . . . 6 + 6. The Ogg page format . . . . . . . . . . . . . . . . . . . . . 9 + 7. Security Considerations . . . . . . . . . . . . . . . . . . . 11 + 8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 12 + A. Glossary of terms and abbreviations . . . . . . . . . . . . . 13 + B. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 14 + Author's Address . . . . . . . . . . . . . . . . . . . . . . . 14 + Full Copyright Statement . . . . . . . . . . . . . . . . . . . 15 + + + + + + + +Pfeiffer Informational [Page 1] + +RFC 3533 OGG May 2003 + + +1. Introduction + + The Ogg bitstream format has been developed as a part of a larger + project aimed at creating a set of components for the coding and + decoding of multimedia content (codecs) which are to be freely + available and freely re-implementable, both in software and in + hardware for the computing community at large, including the Internet + community. It is the intention of the Ogg developers represented by + Xiph.Org that it be usable without intellectual property concerns. + + This document describes the Ogg bitstream format and how to use it to + encapsulate one or several media bitstreams created by one or several + encoders. The Ogg transport bitstream is designed to provide + framing, error protection and seeking structure for higher-level + codec streams that consist of raw, unencapsulated data packets, such + as the Vorbis audio codec or the upcoming Tarkin and Theora video + codecs. It is capable of interleaving different binary media and + other time-continuous data streams that are prepared by an encoder as + a sequence of data packets. Ogg provides enough information to + properly separate data back into such encoder created data packets at + the original packet boundaries without relying on decoding to find + packet boundaries. + + Please note that the MIME type application/ogg has been registered + with the IANA [1]. + +2. Definitions + + For describing the Ogg encapsulation process, a set of terms will be + used whose meaning needs to be well understood. Therefore, some of + the most fundamental terms are defined now before we start with the + description of the requirements for a generic media stream + encapsulation format, the process of encapsulation, and the concrete + format of the Ogg bitstream. See the Appendix for a more complete + glossary. + + The result of an Ogg encapsulation is called the "Physical (Ogg) + Bitstream". It encapsulates one or several encoder-created + bitstreams, which are called "Logical Bitstreams". A logical + bitstream, provided to the Ogg encapsulation process, has a + structure, i.e., it is split up into a sequence of so-called + "Packets". The packets are created by the encoder of that logical + bitstream and represent meaningful entities for that encoder only + (e.g., an uncompressed stream may use video frames as packets). They + do not contain boundary information - strung together they appear to + be streams of random bytes with no landmarks. + + + + + +Pfeiffer Informational [Page 2] + +RFC 3533 OGG May 2003 + + + Please note that the term "packet" is not used in this document to + signify entities for transport over a network. + +3. Requirements for a generic encapsulation format + + The design idea behind Ogg was to provide a generic, linear media + transport format to enable both file-based storage and stream-based + transmission of one or several interleaved media streams independent + of the encoding format of the media data. Such an encapsulation + format needs to provide: + + o framing for logical bitstreams. + + o interleaving of different logical bitstreams. + + o detection of corruption. + + o recapture after a parsing error. + + o position landmarks for direct random access of arbitrary positions + in the bitstream. + + o streaming capability (i.e., no seeking is needed to build a 100% + complete bitstream). + + o small overhead (i.e., use no more than approximately 1-2% of + bitstream bandwidth for packet boundary marking, high-level + framing, sync and seeking). + + o simplicity to enable fast parsing. + + o simple concatenation mechanism of several physical bitstreams. + + All of these design considerations have been taken into consideration + for Ogg. Ogg supports framing and interleaving of logical + bitstreams, seeking landmarks, detection of corruption, and stream + resynchronisation after a parsing error with no more than + approximately 1-2% overhead. It is a generic framework to perform + encapsulation of time-continuous bitstreams. It does not know any + specifics about the codec data that it encapsulates and is thus + independent of any media codec. + +4. The Ogg bitstream format + + A physical Ogg bitstream consists of multiple logical bitstreams + interleaved in so-called "Pages". Whole pages are taken in order + from multiple logical bitstreams multiplexed at the page level. The + logical bitstreams are identified by a unique serial number in the + + + +Pfeiffer Informational [Page 3] + +RFC 3533 OGG May 2003 + + + header of each page of the physical bitstream. This unique serial + number is created randomly and does not have any connection to the + content or encoder of the logical bitstream it represents. Pages of + all logical bitstreams are concurrently interleaved, but they need + not be in a regular order - they are only required to be consecutive + within the logical bitstream. Ogg demultiplexing reconstructs the + original logical bitstreams from the physical bitstream by taking the + pages in order from the physical bitstream and redirecting them into + the appropriate logical decoding entity. + + Each Ogg page contains only one type of data as it belongs to one + logical bitstream only. Pages are of variable size and have a page + header containing encapsulation and error recovery information. Each + logical bitstream in a physical Ogg bitstream starts with a special + start page (bos=beginning of stream) and ends with a special page + (eos=end of stream). + + The bos page contains information to uniquely identify the codec type + and MAY contain information to set up the decoding process. The bos + page SHOULD also contain information about the encoded media - for + example, for audio, it should contain the sample rate and number of + channels. By convention, the first bytes of the bos page contain + magic data that uniquely identifies the required codec. It is the + responsibility of anyone fielding a new codec to make sure it is + possible to reliably distinguish his/her codec from all other codecs + in use. There is no fixed way to detect the end of the codec- + identifying marker. The format of the bos page is dependent on the + codec and therefore MUST be given in the encapsulation specification + of that logical bitstream type. Ogg also allows but does not require + secondary header packets after the bos page for logical bitstreams + and these must also precede any data packets in any logical + bitstream. These subsequent header packets are framed into an + integral number of pages, which will not contain any data packets. + So, a physical bitstream begins with the bos pages of all logical + bitstreams containing one initial header packet per page, followed by + the subsidiary header packets of all streams, followed by pages + containing data packets. + + The encapsulation specification for one or more logical bitstreams is + called a "media mapping". An example for a media mapping is "Ogg + Vorbis", which uses the Ogg framework to encapsulate Vorbis-encoded + audio data for stream-based storage (such as files) and transport + (such as TCP streams or pipes). Ogg Vorbis provides the name and + revision of the Vorbis codec, the audio rate and the audio quality on + the Ogg Vorbis bos page. It also uses two additional header pages + per logical bitstream. The Ogg Vorbis bos page starts with the byte + 0x01, followed by "vorbis" (a total of 7 bytes of identifier). + + + + +Pfeiffer Informational [Page 4] + +RFC 3533 OGG May 2003 + + + Ogg knows two types of multiplexing: concurrent multiplexing (so- + called "Grouping") and sequential multiplexing (so-called + "Chaining"). Grouping defines how to interleave several logical + bitstreams page-wise in the same physical bitstream. Grouping is for + example needed for interleaving a video stream with several + synchronised audio tracks using different codecs in different logical + bitstreams. Chaining on the other hand, is defined to provide a + simple mechanism to concatenate physical Ogg bitstreams, as is often + needed for streaming applications. + + In grouping, all bos pages of all logical bitstreams MUST appear + together at the beginning of the Ogg bitstream. The media mapping + specifies the order of the initial pages. For example, the grouping + of a specific Ogg video and Ogg audio bitstream may specify that the + physical bitstream MUST begin with the bos page of the logical video + bitstream, followed by the bos page of the audio bitstream. Unlike + bos pages, eos pages for the logical bitstreams need not all occur + contiguously. Eos pages may be 'nil' pages, that is, pages + containing no content but simply a page header with position + information and the eos flag set in the page header. Each grouped + logical bitstream MUST have a unique serial number within the scope + of the physical bitstream. + + In chaining, complete logical bitstreams are concatenated. The + bitstreams do not overlap, i.e., the eos page of a given logical + bitstream is immediately followed by the bos page of the next. Each + chained logical bitstream MUST have a unique serial number within the + scope of the physical bitstream. + + It is possible to consecutively chain groups of concurrently + multiplexed bitstreams. The groups, when unchained, MUST stand on + their own as a valid concurrently multiplexed bitstream. The + following diagram shows a schematic example of such a physical + bitstream that obeys all the rules of both grouped and chained + multiplexed bitstreams. + + physical bitstream with pages of + different logical bitstreams grouped and chained + ------------------------------------------------------------- + |*A*|*B*|*C*|A|A|C|B|A|B|#A#|C|...|B|C|#B#|#C#|*D*|D|...|#D#| + ------------------------------------------------------------- + bos bos bos eos eos eos bos eos + + In this example, there are two chained physical bitstreams, the first + of which is a grouped stream of three logical bitstreams A, B, and C. + The second physical bitstream is chained after the end of the grouped + bitstream, which ends after the last eos page of all its grouped + logical bitstreams. As can be seen, grouped bitstreams begin + + + +Pfeiffer Informational [Page 5] + +RFC 3533 OGG May 2003 + + + together - all of the bos pages MUST appear before any data pages. + It can also be seen that pages of concurrently multiplexed bitstreams + need not conform to a regular order. And it can be seen that a + grouped bitstream can end long before the other bitstreams in the + group end. + + Ogg does not know any specifics about the codec data except that each + logical bitstream belongs to a different codec, the data from the + codec comes in order and has position markers (so-called "Granule + positions"). Ogg does not have a concept of 'time': it only knows + about sequentially increasing, unitless position markers. An + application can only get temporal information through higher layers + which have access to the codec APIs to assign and convert granule + positions or time. + + A specific definition of a media mapping using Ogg may put further + constraints on its specific use of the Ogg bitstream format. For + example, a specific media mapping may require that all the eos pages + for all grouped bitstreams need to appear in direct sequence. An + example for a media mapping is the specification of "Ogg Vorbis". + Another example is the upcoming "Ogg Theora" specification which + encapsulates Theora-encoded video data and usually comes multiplexed + with a Vorbis stream for an Ogg containing synchronised audio and + video. As Ogg does not specify temporal relationships between the + encapsulated concurrently multiplexed bitstreams, the temporal + synchronisation between the audio and video stream will be specified + in this media mapping. To enable streaming, pages from various + logical bitstreams will typically be interleaved in chronological + order. + +5. The encapsulation process + + The process of multiplexing different logical bitstreams happens at + the level of pages as described above. The bitstreams provided by + encoders are however handed over to Ogg as so-called "Packets" with + packet boundaries dependent on the encoding format. The process of + encapsulating packets into pages will be described now. + + From Ogg's perspective, packets can be of any arbitrary size. A + specific media mapping will define how to group or break up packets + from a specific media encoder. As Ogg pages have a maximum size of + about 64 kBytes, sometimes a packet has to be distributed over + several pages. To simplify that process, Ogg divides each packet + into 255 byte long chunks plus a final shorter chunk. These chunks + are called "Ogg Segments". They are only a logical construct and do + not have a header for themselves. + + + + + +Pfeiffer Informational [Page 6] + +RFC 3533 OGG May 2003 + + + A group of contiguous segments is wrapped into a variable length page + preceded by a header. A segment table in the page header tells about + the "Lacing values" (sizes) of the segments included in the page. A + flag in the page header tells whether a page contains a packet + continued from a previous page. Note that a lacing value of 255 + implies that a second lacing value follows in the packet, and a value + of less than 255 marks the end of the packet after that many + additional bytes. A packet of 255 bytes (or a multiple of 255 bytes) + is terminated by a lacing value of 0. Note also that a 'nil' (zero + length) packet is not an error; it consists of nothing more than a + lacing value of zero in the header. + + The encoding is optimized for speed and the expected case of the + majority of packets being between 50 and 200 bytes large. This is a + design justification rather than a recommendation. This encoding + both avoids imposing a maximum packet size as well as imposing + minimum overhead on small packets. In contrast, e.g., simply using + two bytes at the head of every packet and having a max packet size of + 32 kBytes would always penalize small packets (< 255 bytes, the + typical case) with twice the segmentation overhead. Using the lacing + values as suggested, small packets see the minimum possible byte- + aligned overhead (1 byte) and large packets (>512 bytes) see a fairly + constant ~0.5% overhead on encoding space. + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Pfeiffer Informational [Page 7] + +RFC 3533 OGG May 2003 + + + The following diagram shows a schematic example of a media mapping + using Ogg and grouped logical bitstreams: + + logical bitstream with packet boundaries + ----------------------------------------------------------------- + > | packet_1 | packet_2 | packet_3 | < + ----------------------------------------------------------------- + + |segmentation (logically only) + v + + packet_1 (5 segments) packet_2 (4 segs) p_3 (2 segs) + ------------------------------ -------------------- ------------ + .. |seg_1|seg_2|seg_3|seg_4|s_5 | |seg_1|seg_2|seg_3|| |seg_1|s_2 | .. + ------------------------------ -------------------- ------------ + + | page encapsulation + v + + page_1 (packet_1 data) page_2 (pket_1 data) page_3 (packet_2 data) +------------------------ ---------------- ------------------------ +|H|------------------- | |H|----------- | |H|------------------- | +|D||seg_1|seg_2|seg_3| | |D|seg_4|s_5 | | |D||seg_1|seg_2|seg_3| | ... +|R|------------------- | |R|----------- | |R|------------------- | +------------------------ ---------------- ------------------------ + + | +pages of | +other --------| | +logical ------- +bitstreams | MUX | + ------- + | + v + + page_1 page_2 page_3 + ------ ------ ------- ----- ------- + ... || | || | || | || | || | ... + ------ ------ ------- ----- ------- + physical Ogg bitstream + + In this example we take a snapshot of the encapsulation process of + one logical bitstream. We can see part of that bitstream's + subdivision into packets as provided by the codec. The Ogg + encapsulation process chops up the packets into segments. The + packets in this example are rather large such that packet_1 is split + into 5 segments - 4 segments with 255 bytes and a final smaller one. + Packet_2 is split into 4 segments - 3 segments with 255 bytes and a + + + +Pfeiffer Informational [Page 8] + +RFC 3533 OGG May 2003 + + + final very small one - and packet_3 is split into two segments. The + encapsulation process then creates pages, which are quite small in + this example. Page_1 consists of the first three segments of + packet_1, page_2 contains the remaining 2 segments from packet_1, and + page_3 contains the first three pages of packet_2. Finally, this + logical bitstream is multiplexed into a physical Ogg bitstream with + pages of other logical bitstreams. + +6. The Ogg page format + + A physical Ogg bitstream consists of a sequence of concatenated + pages. Pages are of variable size, usually 4-8 kB, maximum 65307 + bytes. A page header contains all the information needed to + demultiplex the logical bitstreams out of the physical bitstream and + to perform basic error recovery and landmarks for seeking. Each page + is a self-contained entity such that the page decode mechanism can + recognize, verify, and handle single pages at a time without + requiring the overall bitstream. + + The Ogg page header has the following format: + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1| Byte ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| capture_pattern: Magic number for page start "OggS" | 0-3 ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| version | header_type | granule_position | 4-7 ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| | 8-11 ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| | bitstream_serial_number | 12-15 ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| | page_sequence_number | 16-19 ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| | CRC_checksum | 20-23 ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| |page_segments | segment_table | 24-27 ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| ... | 28- ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + The LSb (least significant bit) comes first in the Bytes. Fields + with more than one byte length are encoded LSB (least significant + byte) first. + + + + + + + +Pfeiffer Informational [Page 9] + +RFC 3533 OGG May 2003 + + + The fields in the page header have the following meaning: + + 1. capture_pattern: a 4 Byte field that signifies the beginning of a + page. It contains the magic numbers: + + 0x4f 'O' + + 0x67 'g' + + 0x67 'g' + + 0x53 'S' + + It helps a decoder to find the page boundaries and regain + synchronisation after parsing a corrupted stream. Once the + capture pattern is found, the decoder verifies page sync and + integrity by computing and comparing the checksum. + + 2. stream_structure_version: 1 Byte signifying the version number of + the Ogg file format used in this stream (this document specifies + version 0). + + 3. header_type_flag: the bits in this 1 Byte field identify the + specific type of this page. + + * bit 0x01 + + set: page contains data of a packet continued from the previous + page + + unset: page contains a fresh packet + + * bit 0x02 + + set: this is the first page of a logical bitstream (bos) + + unset: this page is not a first page + + * bit 0x04 + + set: this is the last page of a logical bitstream (eos) + + unset: this page is not a last page + + 4. granule_position: an 8 Byte field containing position information. + For example, for an audio stream, it MAY contain the total number + of PCM samples encoded after including all frames finished on this + page. For a video stream it MAY contain the total number of video + + + +Pfeiffer Informational [Page 10] + +RFC 3533 OGG May 2003 + + + frames encoded after this page. This is a hint for the decoder + and gives it some timing and position information. Its meaning is + dependent on the codec for that logical bitstream and specified in + a specific media mapping. A special value of -1 (in two's + complement) indicates that no packets finish on this page. + + 5. bitstream_serial_number: a 4 Byte field containing the unique + serial number by which the logical bitstream is identified. + + 6. page_sequence_number: a 4 Byte field containing the sequence + number of the page so the decoder can identify page loss. This + sequence number is increasing on each logical bitstream + separately. + + 7. CRC_checksum: a 4 Byte field containing a 32 bit CRC checksum of + the page (including header with zero CRC field and page content). + The generator polynomial is 0x04c11db7. + + 8. number_page_segments: 1 Byte giving the number of segment entries + encoded in the segment table. + + 9. segment_table: number_page_segments Bytes containing the lacing + values of all segments in this page. Each Byte contains one + lacing value. + + The total header size in bytes is given by: + header_size = number_page_segments + 27 [Byte] + + The total page size in Bytes is given by: + page_size = header_size + sum(lacing_values: 1..number_page_segments) + [Byte] + +7. Security Considerations + + The Ogg encapsulation format is a container format and only + encapsulates content (such as Vorbis-encoded audio). It does not + provide for any generic encryption or signing of itself or its + contained content bitstreams. However, it encapsulates any kind of + content bitstream as long as there is a codec for it, and is thus + able to contain encrypted and signed content data. It is also + possible to add an external security mechanism that encrypts or signs + an Ogg physical bitstream and thus provides content confidentiality + and authenticity. + + As Ogg encapsulates binary data, it is possible to include executable + content in an Ogg bitstream. This can be an issue with applications + that are implemented using the Ogg format, especially when Ogg is + used for streaming or file transfer in a networking scenario. As + + + +Pfeiffer Informational [Page 11] + +RFC 3533 OGG May 2003 + + + such, Ogg does not pose a threat there. However, an application + decoding Ogg and its encapsulated content bitstreams has to ensure + correct handling of manipulated bitstreams, of buffer overflows and + the like. + +8. References + + [1] Walleij, L., "The application/ogg Media Type", RFC 3534, May + 2003. + + [2] Bradner, S., "Key words for use in RFCs to Indicate Requirement + Levels", BCP 14, RFC 2119, March 1997. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Pfeiffer Informational [Page 12] + +RFC 3533 OGG May 2003 + + +Appendix A. Glossary of terms and abbreviations + + bos page: The initial page (beginning of stream) of a logical + bitstream which contains information to identify the codec type + and other decoding-relevant information. + + chaining (or sequential multiplexing): Concatenation of two or more + complete physical Ogg bitstreams. + + eos page: The final page (end of stream) of a logical bitstream. + + granule position: An increasing position number for a specific + logical bitstream stored in the page header. Its meaning is + dependent on the codec for that logical bitstream and specified in + a specific media mapping. + + grouping (or concurrent multiplexing): Interleaving of pages of + several logical bitstreams into one complete physical Ogg + bitstream under the restriction that all bos pages of all grouped + logical bitstreams MUST appear before any data pages. + + lacing value: An entry in the segment table of a page header + representing the size of the related segment. + + logical bitstream: A sequence of bits being the result of an encoded + media stream. + + media mapping: A specific use of the Ogg encapsulation format + together with a specific (set of) codec(s). + + (Ogg) packet: A subpart of a logical bitstream that is created by the + encoder for that bitstream and represents a meaningful entity for + the encoder, but only a sequence of bits to the Ogg encapsulation. + + (Ogg) page: A physical bitstream consists of a sequence of Ogg pages + containing data of one logical bitstream only. It usually + contains a group of contiguous segments of one packet only, but + sometimes packets are too large and need to be split over several + pages. + + physical (Ogg) bitstream: The sequence of bits resulting from an Ogg + encapsulation of one or several logical bitstreams. It consists + of a sequence of pages from the logical bitstreams with the + restriction that the pages of one logical bitstream MUST come in + their correct temporal order. + + + + + + +Pfeiffer Informational [Page 13] + +RFC 3533 OGG May 2003 + + + (Ogg) segment: The Ogg encapsulation process splits each packet into + chunks of 255 bytes plus a last fractional chunk of less than 255 + bytes. These chunks are called segments. + +Appendix B. Acknowledgements + + The author gratefully acknowledges the work that Christopher + Montgomery and the Xiph.Org foundation have done in defining the Ogg + multimedia project and as part of it the open file format described + in this document. The author hopes that providing this document to + the Internet community will help in promoting the Ogg multimedia + project at http://www.xiph.org/. Many thanks also for the many + technical and typo corrections that C. Montgomery and the Ogg + community provided as feedback to this RFC. + +Author's Address + + Silvia Pfeiffer + CSIRO, Australia + Locked Bag 17 + North Ryde, NSW 2113 + Australia + + Phone: +61 2 9325 3141 + EMail: Silvia.Pfeiffer@csiro.au + URI: http://www.cmis.csiro.au/Silvia.Pfeiffer/ + + + + + + + + + + + + + + + + + + + + + + + + + +Pfeiffer Informational [Page 14] + +RFC 3533 OGG May 2003 + + +Full Copyright Statement + + Copyright (C) The Internet Society (2003). All Rights Reserved. + + This document and translations of it may be copied and furnished to + others, and derivative works that comment on or otherwise explain it + or assist in its implementation may be prepared, copied, published + and distributed, in whole or in part, without restriction of any + kind, provided that the above copyright notice and this paragraph are + included on all such copies and derivative works. However, this + document itself may not be modified in any way, such as by removing + the copyright notice or references to the Internet Society or other + Internet organizations, except as needed for the purpose of + developing Internet standards in which case the procedures for + copyrights defined in the Internet Standards process must be + followed, or as required to translate it into languages other than + English. + + The limited permissions granted above are perpetual and will not be + revoked by the Internet Society or its successors or assigns. + + This document and the information contained herein is provided on an + "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING + TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING + BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION + HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF + MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. + +Acknowledgement + + Funding for the RFC Editor function is currently provided by the + Internet Society. + + + + + + + + + + + + + + + + + + + +Pfeiffer Informational [Page 15] + |