No text on CMYK layer (exceptions)
This check looks for any text present on the CMYK layer. If text is intended to be on this layer then an exception can be made.
Typically all text in the interior and prelims sections of co-edition books is placed onto text layers to make it available for translation.
However, in some cases we may want to fix non-translation text such names and numbers to the CMYK layer. Text on the CMYK layer is therefore common to every language edition.
Text on the CMYK layer is not restricted in the same way as text on the text layers and can be coloured using CMYK and have transparency effects used.
A document that intentionally contains text on the CMYK layer can be marked as an exception. This only needs to be done once per document. Once a document has been marked as OK, text on the CMYK layer is no longer flagged as an issue for that document.
The fact that a document has been marked as intentionally containing text on the CMYK is mentioned in the footer info of the GreenLight Report: