Oki ColorPainter E-64s - Manual (Page 83)

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 A RIP error occurred and the job cannot be printed
Cause 1: Security lock
The PDF file has a security lock function applied to it such as a password.
If you attempt raster image processing on the file with the security lock engaged, an error will occur.
PDFs can be set with a password to open the document.
(EPS does not have this option.)
Action
Open the application software that created the file, disable the security lock, and save the file again.
Perform raster image processing on the saved file once again.
Cause 2: Swatches are the cause
You may not be able to perform raster image processing when using transparency effects in swatch patterns
created with old versions of Illustrator (Ver. 7 or earlier).
Action
First rasterize the swatches causing the problems in Illustrator, then save the file again.
Perform raster image processing on the file that was saved again.