You cannot apply for a patent for something that has been in
an unpatented product for more than a year, in the US (IANAL etc.).
So RC4 and RC2 are unpatented and will remain so. There was a
patent application for RC5 and that might be what you are thinking
of. I don't know if the RC5 patent was granted. IMHO, RC2 and RC5
are not very interesting ciphers; RC4 is the one that's widely used
and interesting.
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