For what it's worth, the epub specification allows the following files to be placed in the meta-inf directory. Any other files make this an invalid epub file.
Quote:
The OCF Abstract Container file system model uses a single common Root Directory for all of the contents. All Local Resources for the EPUB Publication are located within the directory tree headed by the Root Directory, but no specific file system structure for them is mandated by this specification.
The file system model also includes a mandatory directory named META-INF that is a direct child of the Root Directory and is used to store the following special files:
container.xml [required]
Identifies the Package Documents that define each Rendition of the EPUB Publication.
signatures.xml [optional]
Contains digital signatures for various assets.
encryption.xml [optional]
Contains information about the encryption of Publication Resources. This file is mandatory when obfuscation is used.
metadata.xml [optional]
Used to store metadata about the OCF ZIP Container.
rights.xml [optional]
Used to store information about digital rights.
manifest.xml [optional]
A manifest of container contents as allowed by Open Document Format [ODF].
Conformance requirements for the various files in the META-INF directory are defined in META-INF Directory.
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