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Re:HackRF, an open source SDR platform by ortusdux on Wednesday July 31, 2013 @11:47AM (#6134576)
Here is a spec sheet from '96:

http://www.ti.com/lit/ds/slws011d/slws011d.pdf

Back then they used a 40 bit rolling code.

Found here: http://auto.howstuffworks.com/remote-entry2.htm

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