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The current license key does not give you access to a feature used by the file (e.g., AES encryption).
This particular skipping reason can occur for the following reasons:
A license key for an older version of Xceed Zip (prior to v6.0) is being used.
A limited registered license key (ZIL) is being used.
A password other than "This is a trial password" was provided in the ZipPreprocessingFile, UnzipPreprocessingFile, or InvalidPassword events while using a trial "ZIP" license key.
A file that uses AES encryption was encountered, but the current license key doesn't enable this feature. Contact Xceed sales to upgrade the library to a license that enables the use of AES encryption.