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For questions involving the creation, use, sale, import or export of patented items without permission from the patent holder or any person legally entitled to grant a license. Also for questions regarding the legal implications for the patent holder or the infringer. If you are beeing sued or put on notice for patent infringement please note that this can cost A LOT of money, you should consult a patent attorney.

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Would it be legal to use Square's credit card reader for a startup?

Square's credit card reader technology is patented. Here's a claim from patent US7810729 for illustration: 1. A card reader device for reading a card having data stored on a magnetic stripe incorpor …
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