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==Patent challenges==
{{main|ECC patents}}
On 30 May 2007, Canadian encryption vendor [[Certicom]] sued Sony alleging that AACS violated two of its patents, "Strengthened public key protocol"<ref>
{{cite web
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| archiveurl= https://web.archive.org/web/20070602130802/http://arstechnica.com/news.ars/post/20070531-encryption-vendor-claims-aacs-infringes-its-patents-sues-sony.html| archivedate= 2 June 2007 | url-status= live}}
</ref>
The lawsuit was dismissed on May 27, 2009.<ref>{{cite web
| url=http://dockets.justia.com/docket/texas/txedce/2:2007cv00216/103383/
| title=Certicom Corporation et al v. Sony Corporation et al Featured Case Has Decisions
| date=2009-05-27
| publisher=justia.com
| accessdate=2013-08-12}}</ref>
==See also==
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