Patents conflict with copyrights in various ways.
 Prevents use of your own work
When someone writes software, they usually want to distribute it or sell it. Patents allow a third-party who contributed nothing to the writing of the software to block such distribution or sale.
(Many anti-swpat people say "We have copyright, that's enough" - how can that be explained here??)
 Patent applications can violate copyright
- Copyright: Lawfirms Sued for Submitting Prior Art to the USPTO, Patently-O
- Copyright Lawsuit against Patent Firms Continue: Firms Claim Fair Use and Copyright Misuse, 23 Apr 2012, Patently-O
This is obviously a particularly big problem for fields of development such as software which focus on producing copyrightable works.
- In Defence of the Software Author, 18 Aug 2004, Christian Beauprez
- Translation: (in French) http://www.ffii.fr/Protection-de-l-auteur-de-logiciels.html
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