For a document or set of documents to be considered part of the World Heritage Site by UNESCO, it must meet certain characteristics.[7] Authenticity is an essential requirement, which implies that it must be verifiable that there are no exact copies or imitations of it. The document must be unique and irreplaceable, which means that its loss would represent a significant impoverishment of the World Heritage Site, due to its historical relevance. The global significance of a document is evaluated based on its relationship to the time, its geographical importance, and its impact on key people or groups in history. The central theme of the document must reflect a relevant aspect within the historical and social context of its production, and its form and style must be appropriate to preserve its original materiality and medium. Rarity refers to the document being a unique representative of others that have disappeared. The integrity of the document is evaluated to ensure that it is complete and has not been mutilated. The threat addresses the risks to their safety and conservation in the protected area. In addition, a management plan is required that includes measures for its preservation, conservation and dissemination.[7]​.

The importance of documentary heritage lies in its function as a memory of civilizations. Therefore, the nature of its importance can be noted in the areas: Historical, scientific and cultural. According to the General Conference of UNESCO "The documents preserved in the world's archives and libraries constitute indispensable sources of many intellectual disciplines. They are also sources of less structured activities such as self-learning, recreational activities and other general interests. Without these documents, it would be impossible to analyze politics, history, human life, music or entertainment."[8] Being a manifestation of the history of humanity, documentary heritage is one of the foundations for both the understanding of societies. current as well as for the personal enrichment of the individual and for the evolution of societies themselves, since it promotes the exchange of knowledge in favor of greater understanding and dialogue, in order to promote peace and respect for freedom, democracy, human rights and dignity."[9]​ Just as the preservation of biological diversity is fundamental for the evolution of species, the preservation of cultural diversity is essential for the development of human creativity."[10]​.

Detachments from the covers, Detachments from the spines, Detachments from the booklets, Breaks and wear on the edges of the leaves, Moisture stains, High acidity of the leaves making them brittle to the touch, Rusty clips that add acidity to the leaves and break the area where they are located, Support fatigue in some copies which makes them susceptible to breaking due to bends, Warping of the support, Total and partial loss of cover, Generalized dirt in the form of specks of dust, Exfoliations and abrasions on the covers.

The preservation of documentary heritage encompasses a set of techniques, treatments, procedures and technologies of a very diverse nature, of a preventive and corrective nature, intended to preserve the documents and the information contained in them. [12]​.

Preservation is the sum of measures necessary to guarantee the permanent accessibility - forever - of the documentary heritage. The Memory of the World Program promotes preservation in a variety of ways, including through principled support, awareness-raising, education and training, technical cooperation agreements and direct support of a limited number of specific projects. A number of important factors must be taken into account, such as the environment, the type of material, the proposed preservation/conservation strategy, access to preservation techniques and knowledge, control of documentation and collections, and access arrangements.[13]​.

Conservation are actions aimed at avoiding or slowing the progression of deterioration in order to protect and ensure the material life of cultural assets, without aiming at the restitution of aesthetic and historical values ​​through procedures and/or treatments performed on the objects.[10]​.

There are techniques and programs that allow the digitization of musical information to preserve, from the sound corresponding to a particular interpretation of a musical work, in the form of a sound signal that can be processed by audio editing programs, to the image of the score handwritten by the composer himself, with the possibilities that this offers for the restoration of the possible deterioration suffered by the original document. [14]​.

Different types of media can be found in audiovisual archives; however, to date, the most common are cinematographic film and video. Cinema as an audiovisual heritage, which until the appearance and popularization of video was the audiovisual medium par excellence, has been traditionally preserved and treated in film libraries or cinematheques, organizations dedicated to the archive, exhibition, preservation and dissemination of cinematographic works, as well as the conservation of techniques and types of filming in disuse. Since its commercial dissemination in the 1970s, video represented the synthesis of preceding technologies – film, disk and photography – facilitating the recording, conservation and reproduction of sound along with the conservation and reproduction of the image. The popularity acquired means that he is found in various institutions that provide him with similar treatment although adapted to his particular needs. Compared to the textual discourse and the fixed visual document, the media that rely on the mobile image and sound pose problems in the analysis process, due to the mobile and transitory nature of the messages they emit. The documentary filmmaker will be forced to review or re-audition and the sequences will be defined and located using a stopwatch. Now, audiovisual documents represent the synthesis of the interrelation between image and word, since they support each other to resolve the deficiencies that each subsystem has on its own. Just as photography needs the caption text to focus the meaning of the image, here it is the sound that performs the necessary contextualizing function. In addition, the sequential overlay of images also helps explain the messages. Audiovisual documents are more semantically precise than visual documents and more semantically complete than audio documents. Given that audiovisual information is made up of elements that belong to the field of images and sound, its study must be approached from a double dimension:

Elements of conservation:.

There are different methods and techniques for preserving documentation, as well as several types of formats for storing information.

There are key elements to take into account that are fundamental to preserve and protect documentary heritage.

Some of the elements of conservation are the following:.

Audiovisual Documents: This element includes all types of audiovisual content which includes: radio programs, movies, short films, television, audio and video recordings.

These elements are essential to know history and analyze the society and culture of different times, preserving history.

Document Management: The correct way of managing audiovisual documents is really important. Which involves processes such as storage, cataloguing, searching, accessing, consulting, retrieving, transferring and recording information. Digitalization is a key factor to improve these processes.

Audiovisual Files: These files not only store documents, but also facilitate access to audiovisual sources. Archives are present in sectors such as cinema, television and radio broadcasting and their main function is to guarantee permanent accessibility to documents.

Support Integrity: It is important to keep in mind that all types of activity related to information must contain supports and must also be supported. Audiovisual documents are found in different formats (photographic, cinematographic, digital, etc.). It is important to maintain the integrity of these supports as it is essential for their preservation.

Support Selection and Preparation: It is always necessary to keep in mind that the best existing copy must be selected and the support prepared for conservation. Which implies the evaluation of the quality and condition of the original material.

At the dawn of the century, the notion of cultural heritage has not ceased to be enriched with a global anthropological and sociological approach that leads to considering it as a set of diverse manifestations, which has been received from our past, which have become irreplaceable testimonies that represent the development of a society and must be transmitted to future generations. The concepts of cultural heritage have been associated for centuries with monuments that express the excellence of human work, which is why some have been overvalued and others forgotten. When we talk about historical heritage, it is a collective, not individual, inheritance, the product of events that occurred, characters, material objects that have transcended over time, and the social space, which become part and essence of the history of a place. These cultural objects are emissaries and links between human generations and are formed through a social construction, which is diverse and responds to the exclusive ways of manifesting the society to which it belongs.[15]​.

Historical heritage is related to various material assets such as built heritage, in the past, this could refer only to historical monuments, today, in this century, this notion is much broader, heritage can also be: urban, rural, modest, vernacular, popular, industrial, among others.[15]​.

The natural heritage can also be taken into account, which is the development of the formation of nature over the course of different eras, but let us not forget the work of human beings in their context, which keeps culture alive and is part and judge of that heritage, which makes up cultural landscapes in their different categories.[15]​.

«In order for society to know it (cultural heritage) and use it, by right, it is necessary that cultural heritage be studied and analyzed from various approaches that allow identifying the expressions that make up the heritage in order to satisfy cultural, educational and social needs based on the identity, nationality, significance and impact of cultural heritage. internet, the use of social media, conferences, educational programs, special events and the digitization of content for download.

For a document or set of documents to be considered part of the World Heritage Site by UNESCO, it must meet certain characteristics.[7] Authenticity is an essential requirement, which implies that it must be verifiable that there are no exact copies or imitations of it. The document must be unique and irreplaceable, which means that its loss would represent a significant impoverishment of the World Heritage Site, due to its historical relevance. The global significance of a document is evaluated based on its relationship to the time, its geographical importance, and its impact on key people or groups in history. The central theme of the document must reflect a relevant aspect within the historical and social context of its production, and its form and style must be appropriate to preserve its original materiality and medium. Rarity refers to the document being a unique representative of others that have disappeared. The integrity of the document is evaluated to ensure that it is complete and has not been mutilated. The threat addresses the risks to their safety and conservation in the protected area. In addition, a management plan is required that includes measures for its preservation, conservation and dissemination.[7]​.

The importance of documentary heritage lies in its function as a memory of civilizations. Therefore, the nature of its importance can be noted in the areas: Historical, scientific and cultural. According to the General Conference of UNESCO "The documents preserved in the world's archives and libraries constitute indispensable sources of many intellectual disciplines. They are also sources of less structured activities such as self-learning, recreational activities and other general interests. Without these documents, it would be impossible to analyze politics, history, human life, music or entertainment."[8] Being a manifestation of the history of humanity, documentary heritage is one of the foundations for both the understanding of societies. current as well as for the personal enrichment of the individual and for the evolution of societies themselves, since it promotes the exchange of knowledge in favor of greater understanding and dialogue, in order to promote peace and respect for freedom, democracy, human rights and dignity."[9]​ Just as the preservation of biological diversity is fundamental for the evolution of species, the preservation of cultural diversity is essential for the development of human creativity."[10]​.

Detachments from the covers, Detachments from the spines, Detachments from the booklets, Breaks and wear on the edges of the leaves, Moisture stains, High acidity of the leaves making them brittle to the touch, Rusty clips that add acidity to the leaves and break the area where they are located, Support fatigue in some copies which makes them susceptible to breaking due to bends, Warping of the support, Total and partial loss of cover, Generalized dirt in the form of specks of dust, Exfoliations and abrasions on the covers.

The preservation of documentary heritage encompasses a set of techniques, treatments, procedures and technologies of a very diverse nature, of a preventive and corrective nature, intended to preserve the documents and the information contained in them. [12]​.

Preservation is the sum of measures necessary to guarantee the permanent accessibility - forever - of the documentary heritage. The Memory of the World Program promotes preservation in a variety of ways, including through principled support, awareness-raising, education and training, technical cooperation agreements and direct support of a limited number of specific projects. A number of important factors must be taken into account, such as the environment, the type of material, the proposed preservation/conservation strategy, access to preservation techniques and knowledge, control of documentation and collections, and access arrangements.[13]​.

Conservation are actions aimed at avoiding or slowing the progression of deterioration in order to protect and ensure the material life of cultural assets, without aiming at the restitution of aesthetic and historical values ​​through procedures and/or treatments performed on the objects.[10]​.

There are techniques and programs that allow the digitization of musical information to preserve, from the sound corresponding to a particular interpretation of a musical work, in the form of a sound signal that can be processed by audio editing programs, to the image of the score handwritten by the composer himself, with the possibilities that this offers for the restoration of the possible deterioration suffered by the original document. [14]​.

Different types of media can be found in audiovisual archives; however, to date, the most common are cinematographic film and video. Cinema as an audiovisual heritage, which until the appearance and popularization of video was the audiovisual medium par excellence, has been traditionally preserved and treated in film libraries or cinematheques, organizations dedicated to the archive, exhibition, preservation and dissemination of cinematographic works, as well as the conservation of techniques and types of filming in disuse. Since its commercial dissemination in the 1970s, video represented the synthesis of preceding technologies – film, disk and photography – facilitating the recording, conservation and reproduction of sound along with the conservation and reproduction of the image. The popularity acquired means that he is found in various institutions that provide him with similar treatment although adapted to his particular needs. Compared to the textual discourse and the fixed visual document, the media that rely on the mobile image and sound pose problems in the analysis process, due to the mobile and transitory nature of the messages they emit. The documentary filmmaker will be forced to review or re-audition and the sequences will be defined and located using a stopwatch. Now, audiovisual documents represent the synthesis of the interrelation between image and word, since they support each other to resolve the deficiencies that each subsystem has on its own. Just as photography needs the caption text to focus the meaning of the image, here it is the sound that performs the necessary contextualizing function. In addition, the sequential overlay of images also helps explain the messages. Audiovisual documents are more semantically precise than visual documents and more semantically complete than audio documents. Given that audiovisual information is made up of elements that belong to the field of images and sound, its study must be approached from a double dimension:

Elements of conservation:.

There are different methods and techniques for preserving documentation, as well as several types of formats for storing information.

There are key elements to take into account that are fundamental to preserve and protect documentary heritage.

Some of the elements of conservation are the following:.

Audiovisual Documents: This element includes all types of audiovisual content which includes: radio programs, movies, short films, television, audio and video recordings.

These elements are essential to know history and analyze the society and culture of different times, preserving history.

Document Management: The correct way of managing audiovisual documents is really important. Which involves processes such as storage, cataloguing, searching, accessing, consulting, retrieving, transferring and recording information. Digitalization is a key factor to improve these processes.

Audiovisual Files: These files not only store documents, but also facilitate access to audiovisual sources. Archives are present in sectors such as cinema, television and radio broadcasting and their main function is to guarantee permanent accessibility to documents.

Support Integrity: It is important to keep in mind that all types of activity related to information must contain supports and must also be supported. Audiovisual documents are found in different formats (photographic, cinematographic, digital, etc.). It is important to maintain the integrity of these supports as it is essential for their preservation.

Support Selection and Preparation: It is always necessary to keep in mind that the best existing copy must be selected and the support prepared for conservation. Which implies the evaluation of the quality and condition of the original material.

At the dawn of the century, the notion of cultural heritage has not ceased to be enriched with a global anthropological and sociological approach that leads to considering it as a set of diverse manifestations, which has been received from our past, which have become irreplaceable testimonies that represent the development of a society and must be transmitted to future generations. The concepts of cultural heritage have been associated for centuries with monuments that express the excellence of human work, which is why some have been overvalued and others forgotten. When we talk about historical heritage, it is a collective, not individual, inheritance, the product of events that occurred, characters, material objects that have transcended over time, and the social space, which become part and essence of the history of a place. These cultural objects are emissaries and links between human generations and are formed through a social construction, which is diverse and responds to the exclusive ways of manifesting the society to which it belongs.[15]​.

Historical heritage is related to various material assets such as built heritage, in the past, this could refer only to historical monuments, today, in this century, this notion is much broader, heritage can also be: urban, rural, modest, vernacular, popular, industrial, among others.[15]​.

The natural heritage can also be taken into account, which is the development of the formation of nature over the course of different eras, but let us not forget the work of human beings in their context, which keeps culture alive and is part and judge of that heritage, which makes up cultural landscapes in their different categories.[15]​.

«In order for society to know it (cultural heritage) and use it, by right, it is necessary that cultural heritage be studied and analyzed from various approaches that allow identifying the expressions that make up the heritage in order to satisfy cultural, educational and social needs based on the identity, nationality, significance and impact of cultural heritage. internet, the use of social media, conferences, educational programs, special events and the digitization of content for download.