> RSA algorithms are being
> broken with efforts such as www.distributed.net

Consider that it still took distributed.net 250 days to break a 56-bit
key...

> Does expiration of RSA copyright have any impact on ease of
> cracking RSA key size?

No.

> Why do we even have RSA encryption in
> first place? Is RSA essential to netrek and future vanilla
> releases? If so, why?

To verify that official clients really are official -- without some sort of
verification, writing a borg would be absolutely trivial.

-Jonathan