Under which conditions can I use a work protected by copyright created by another? I was told that using works created by others is simply a quote and thus is always allowed.

Irish law contains a large number of mechanisms whereby a user may seek to gain access rights and rights to use copyright works under licensing mechanisms. However, online use and commercial use in particular will be problematic as a result of rights holder reluctance to authorise free use or unremunerated use in certain instances. The Irish quotation provisions in Section 52(4) CRRA 2000 are, however, quite extensive and do not require remuneration to be provided by the user.