 Some people feel that learning Kid-RSA gives insight into RSA and other public-key ciphers, analogous to simplified DES.MIT was granted for a "Cryptographic communications system and method" that used the algorithm, on September 20, 1983.Though the patent was going to expire on September 21, 2000 (the term of patent was 17 years at the time), the algorithm was released to the public domain by RSA Security on September 6, 2000, two weeks earlier.