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You can (optionally) also do additional verification by:

1. Check hashes (e.g

   . md5sum -c *.md5 and sha512sum -c *.sha1

   . md5sum *.md5 > checklist.chk; md5sum -c checklist.chk and shasum *.sha > checklist.chk; shasum -c checklist.chk)

2. Check signatures (e.g. gpg --verify flink-1.2.3-source-release.tar.gz.asc flink-1.2.3-source-release.tar.gz)
3. grep for legal headers in each file.

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