암호 알고리즘과 관련해서^^;

U.S. Patent 3,962,539, which describes the Data Encryption Standard (DES), was assigned to IBM Corporation in 1976. IBM subsequently placed the patent in the public domain, offering royalty-free licenses conditional on adherence to the specifications of the standard. The patent expired in 1993.

On September 6, 2000, RSA Security made the RSA algorithm publicly available and waived its rights to enforce the RSA patent for any development activities that include the algorithm occurring after September 6, 2000. From this date forward, companies are able to develop products that incorporate their own implementation of the RSA algorithm and sell these products in the U.S.