Also, some words might need to be split into phrases. For instance, "software license key" is a phrase. But the user said to switch each word, so each word individually. So "software" could be "program", "application", "tool". "License key" is a proper noun in context, so maybe it stays, but "license" could be "license", though the user said proper nouns stay. Wait, license here is not a proper noun. So "license" could be "permit", "authorization", "privilege". But in the context, it's part of the term "license key", so maybe best to treat "license key" as a single term. However, the user specified each word, so "license" and "key" separately.
Continuing with the rest. "obtain" as Secure, "valid" as Valid, "license key" as Authorization code. license key securecrt 8.1
Finally, "Improved performance" becomes Optimized performance? The user might prefer "operations" over "performance," but "performance" is part of the original text. So perhaps keep "performance" and adjust the adjective. Wait, the original says "Improved performance: SecureCRT 8.1 offers..." So the structure is "Improved performance" as a feature. So the substitution would be for "Improved" and "performance." "Improved" can be Enhanced, and "performance" as Operation. Also, some words might need to be split into phrases