Little Snitch license keys can be distinguished by their first two characters:
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Little Snitch 5 license keys begin with “35…”
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Little Snitch 4 license keys begin with “34…”.
If the license was purchased after November 1, 2019, it’s also valid for version 5. -
Little Snitch 3 license keys begin with “33…”
- Little Snitch 2 license keys begin with “32…”