>Isn't the RDS protocol a published standard,
>both the US and the European versions?
>
>It's just a matter of paying the fees for a copy
>of the standard from the standards entity.
>
>Of course, implementations of the standards may involve
>patents or other IPR, but the actual standards themselves
>are open documents, subject to paying the copying charge.

Looking at the datasheets for RDS chips, I am not sure that there is really
anything that fancy in the "decoder" (really demodulator) part, to get a
serial data stream with clock. But I guess these chips are actually decoding
the serial stream into usable data for display (haven't tried to look at the
article).

This guy has done an encoder
http://renaud.cerrato.free.fr/oscillator.html#57K for RDS. Searching for RDS
on the web does bring up a fair bit of information.

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