If you search for "catia v5r19 js0group dll crack", you will often see the word crack amongst the results, which implies it is the full version of the product.
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A keygen is made available by crack groups free to download.
If you search a site for Liscad 6.2 Keygen, you may see the word "keygen" in the results which usually means your download includes a keygen.
Crack in this context means the action of removing the copy protection from software or to unlock features from a demo or time-limited trial.