+1 on this.Copy does not equal counterfeit.
Copies are good. Keeps designers from getting fat and lazy.
Counterfeits are frauds. They fool customers and damage brand names unfairly.
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There is a difference between the copies that utilize existing design, and clones that use the exact same dimensions & branding.
Once they slap a name and logo on there, then it's just deceiving and definitely crossing the line.
I think knives such as the Sanrenmu 710 and the Inron MY803 that sell for under $20 are fine since they are obviously not trying to replace their more expensive and better-made counterparts. However, the infamous Strider SMF DGG clone is definitely crossing the line as it uses the identical dimensions and has the name and logo stamped on. Unlawfully branding an inferior product with the name of a trusted quality brand is pure deceit.
An example outside of the knife hobby is the design of the Hyundai Genesis Sedan. People can say with confidence that the Hyundai utilized design cues from Mercedes (E- and S-Class), but the general population doesn't really care as long as they don't slap on a Mercedes badge because there is enough difference in performance and quality between the two.
tl;dr: Copying a design is ok, but unlawful branding is not.
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