Discussing this issue is strictly forbidden here.
However, there are many legitimately freely available public domain (out of copyright) books which you will find for free on many websites, such as this one. You can also find annotated, or other, versions of the same book on Amazon for which you have to pay.
The rules for public domain will vary depending on your country. In the UK it is the date of the author's death plus 70 years.
Don't pirate. And don't discuss the subject here.
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