The ISSN is a unique identification number for periodicals (journals, yearbooks, newsletters, monograph series, etc.).
Unlike the ISBN (for books), it is not necessary for the periodic publication to be vouchers to have ISSN. Moreover, it is recommended that all periodic publications (in paper or electronic format) be available.
La Library of Catalonia Manages the allocation of the ISSN number for serial publications published by companies and entities based in Catalonia since January of 2008, as a result of the transfer of functions and services related to this competition in the Generalitat of Catalonia (Royal Decree 1405 / 2007, of 29 of October of 2007).
As detailed in its website:
For journals and other periodicals edited by members of the scientific community of the UPC and deposited electronically on the deposit UPCommons, the Intellectual Property Service facilitates the processing through your form
People interested in applying for the ISSN for journals not deposited in UPCommons, they can do it for free using the form of the Library of Catalonia, provided that the detailed requirements are taken into account your web. For example, in the case of printed publications, the following information must be taken into account: