According to the present invention there is also provided a method of enabling analysis of similarity of {HEAD ~ instances} of communication content while preserving confidentiality, comprising: capturing communication content including instances of communication content that can be rendered into text; processing the captured communication content to adjust a level of {TAIL ~ similarity} between separate instances of communication content; and hashing at least part of the processed communication content to obscure the actual communication content and to produce hashed tokens 
According to the present invention there is also provided a method of enabling analysis of similarity of { HEAD ~ instances } of communication content while preserving confidentiality , comprising : capturing communication content including instances of communication content that can be rendered into text ; processing the captured communication content to adjust a level of { TAIL ~ similarity } between separate instances of communication content ; and hashing at least part of the processed communication content to obscure the actual communication content and to produce hashed tokens
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