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EPUBCheck · Resources and references

RSC-004

Updated:

EPUBCheck RSC-004 is an info message: “File "…" is encrypted, its content will not be checked.” A file is encrypted (listed in META-INF/encryption.xml), so EPUBCheck cannot read it and skips its checks.

The official message

File "%1$s" is encrypted, its content will not be checked.

Default severity
Info. Informative only. It does not make the EPUB invalid.
EPUBCheck version
5.4.0

%1$s, %2$s… are filled in with the file, value or element EPUBCheck found.

Typical causes

  • Books protected with DRM, where content files are encrypted with a method EPUBCheck cannot read.

How to fix it

  • Nothing to fix if the encryption is intended; validate the unencrypted source EPUB to check the content.

Terms used here

Other RSC messages

  • RSC-003 No rootfile tag with media type "application/oebps-package+xml" was found in the container.
  • RSC-005 Error while parsing file: …
  • RSC-002 Required META-INF/container.xml resource could not be found.
  • RSC-006 Remote resource reference is not allowed in this context; resource "…" must be located in the EPUB container.
  • RSC-001 File "…" could not be found.
  • RSC-007 Referenced resource "…" could not be found in the EPUB.

Message text and severity from EPUBCheck 5.4.0 (W3C, BSD-3-Clause). Explanation by EPUBLab.

FAQ

What does EPUBCheck RSC-004 mean?

EPUBCheck RSC-004 is an info message: “File "…" is encrypted, its content will not be checked.” A file is encrypted (listed in META-INF/encryption.xml), so EPUBCheck cannot read it and skips its checks.

Is RSC-004 an error?

RSC-004 is reported as info by default. Informative only. It does not make the EPUB invalid.