21. � Reproduction, broadcasting and other communication to the public for informatory purposes The following acts shall be permitted in respect of a work without the authorisation of the author or other owner of copyright, subject to the obligation to indicate the source and the name of the author, as far as practicable, where — (a) ­ the reproduction in a newspaper or periodical, the broadcasting or other communication to the public, of an article published in a newspaper or periodical on current economic, political or religious topics or a broadcast work of the same character except that this permission shall not apply where the right to authorise reproduction, broadcasting or other communication to the public is expressly reserved on the copies by the author or other owner of copyright, or in connection with broadcasting or other communication to the public of the work; (b) ­ for the purpose of reporting current events, the reproduction and the broadcasting or other communication to the public of short excerpts of a work seen or heard in the course of such events, to the extent justified by the purpose; (c) ­ the reproduction in a newspaper or periodical, the broadcasting or other communication to the public of a lecture, address, sermon or other work of a similar nature delivered in public, to the extent justified by the purpose of providing current information. 22. � Reproduction, adaptation of computer programmes and decompilation (1) The reproduction, in a single copy, or the adaptation of a computer programme by the lawful owner of a copy of that computer programme shall be permitted without the authorisation of the author, or other owner of copyright where the copy or adaptation is necessary for — (a) ­ use of the computer programme with a computer for the purpose and extent for which the computer programme has been obtained;