They are subject to Legal Deposit (DL) publications which are part of the bibliographic and cultural heritage of Catalonia: books and brochures, print-on-demand publications, magazines, maps, audiovisual documents, commercial catalogs of bookstores, publishers and auctions, ...

Second and subsequent editions of a work also require the corresponding DL, unlike reprints (which will retain the DL number assigned to the edition they reproduce)

The mandatory DL of publications depends on some aspects such as their purpose of dissemination or distribution, which is why some are excluded documents that do not comply with them: documents on internal matters of organizations addressed to their staff, instruction manuals, commercial catalogs except those of publishing houses, bookstores and auctions, ... In case of doubt, the management of the Library of Catalonia is who determines it.

As determined by Law 23 / 2011, from 29 July, of legal deposit, the publishers of the works are responsible for processing the legal deposit (DL). Therefore, each of the editorial units of the UPC (basic, functional or other units) must request the DL of their publications as detailed below:

When an author publishes his work without the intervention of any publisher or printer (authors-editors), he may also request the DL number by personally addressing the "Office of the legal deposit closer and presenting the DNI and certain data of address, telephone and email.

Before applying for a Legal Deposit (DL), the publishing units of the UPC they must bear in mind that:

1. Once the request has been made through the formand, the applicant will receive by email the corresponding DL number.
2. Next, the publishing unit will have to include the DL in the publication, always respecting them Guidelines set by the DL Office:

• In books and printed brochures the number of DL will appear on the same sheet as the ISBN, on the back of the cover or on the cover (sheet that precedes the cover of a book and where there is usually only the title of the work).

• In the daily press, yearbooks and printed magazines, the number of DL will appear in the header of each copy. In magazines with a cover and book format, it will appear on the back of the cover or on the cover.

• The rest of the forms will carry the DL number in a clearly visible place.

• The discs (sound, CD-ROM, etc.) will have the DL number printed on the label or on the center of the board and on the cover of each disc. The manufacturer of the disc must provide the printer of the bag or container with the DL number, in the event that the manufacturer of the disc and the container are not the same.

• The DL must be included in this format, preceded by the abbreviations "DL" (without any point). The different volumes of a unitary work (multivolum work) have the same number of DL (although they have different ISBNs) followed, in roman numerals and in parentheses, of the number that corresponds to the volume. 

Once the work has been printed with the Legal Deposit (DL) and before its distribution or sale, the applicant must take the following actions:

• Send several copies to the Libraries, Publications and Archives Service (SBPA), which will guarantee their preservation and conservation as part of the bibliographic and documentary heritage.

Failure to send the copies is subject to sanction by the DL Office, a sanction that must be assumed by the unit of the UPC applicant. Therefore, it is very important to keep in mind that this delivery of copies is mandatory, whatever the type of publication (book, magazine, map ...), the format (paper, CD ...), and / or is intended for sale or not.

Periodicals (magazines, newspapers or yearbooks) are assigned a single DL number for the entire work to be printed in each issue. However, even if the DL is the same, it will be necessary to send the corresponding 4 copies of each published number to the DL Office.

The cancellation of the edition of any work (for example, the closing of the publication of a magazine) must be communicated to the DL Office, communication that the people or entities requesting the UPC can do by means of form of the SBPA.

Given that the SBPA has a courier service with which it can send the copies to the DL Office of the Biblioteca de Catalunya, applicants can send them by internal mail to the following address:

Physical copies must be delivered before two months, counted from the date of the application:

• The applicant must also send by e-mail (to the address provided by the SBPA) the digital file prior to the printing of the work, with the detailed format to: https://deposito.dl-e.es/dlp/es/help. For example, in the case of complete monographs (in a single file) or monographs (split into parts in several files):

• The file should preferably be in PDF format, and unprotected from DRM
• If it's a complete work in a single file, name it with the ISBN without hyphens and, if it doesn't have one, with the DL:

9788420404967.pdf
M 4410-2010.pdf

• If it is a complete work divided into different files for each part (cover and body, chapters, volumes, ...), each file must be named according to this pattern:

9788420404967_01-cover.pdf
9788420404967_02-body.pdf