Suing makers of unfounded accusations
Being able to easily sue makers of unfounded accusations may make such allegations less profitable and thus less common.
Of course, this requires a lawyer and readiness to go to court. Many software developers have neither and most small- and medium-sized businesses won't find it worthwhile. This mechanism might only become useful if it was quick and free.
 In the USA: Slander of title
On what is needed:
Allegations of patent infringement can be slander of title if they are false, reasonably calculated to cause harm, and result in special damages. The court found insufficient evidence of malice to create a jury question. “Mere falsity, prior disputes between the parties, and ‘[s]uspicion, surmise and accusation’ are insufficient to raise an inference of malice.”
 Also possible: Abuse of process?
In the ruling of France's Tribunal de Grande Instance de Paris in the case Samsung v. Apple (2011, France), the judge commented that Samsung's litigation:
The Hague Court also mentioned that it could not be excluded that Samsung’s action be considered on the merits as an abuse of the right to initiate legal actions.
Original: Le tribunal de la Haye a également indiqué qu'il ne pouvait pas être exclu que l'action de SAMSUNG soit considérée au fond comme un abus du droit d'ester en justice.
- What *Is* Slander of Title, Anyway?, 11 Feb 2004, Groklaw
- (Halfway down, there's a section called) Slander of Title, 14 Feb 2003, Findlaw
- Abuse of process, Wikipedia
- Slander of title, Wikipedia
- "This charming lawsuit (Rebecca Tushnet's 43(B)log)". 2 Oct 2007. http://tushnet.blogspot.com/2007/10/this-charming-lawsuit.html.
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