Pursuant to Art. 13 para. 1 CopA, libraries have to pay remuneration if they charge a lending fee. The term lending fee is defined in detail in para. 1.3. and 1.4. of Joint Tariff 6a, offering works for rent in libraries. This agreement was concluded between the collective rights management organisation ProLitteris and the libraries. If a library charges a fee for lending books to readers, it has to pay remuneration to ProLitteris pursuant to Art. 13 para. 1 CopA. The remuneration for books is 9% of the fee paid by the users (cf. para. 4.1 (c) JT 6a).