Cryptography General Question:
Is RSA Patented?
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Answer:
RSA is patented under U.S. Patent 4,405,829, issued September 20, 1983 and held by RSA Data Security, Inc. of Redwood City, California; the patent expires 17 years after issue, in 2000. RSA Data Security has a standard, royalty-based licensing policy which can be modified for special circumstances. The U.S. government can use RSA without a license because it was invented at MIT with partial government funding.
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