Thanks for all your help, ben.

Just talked to LH again, the exact fare class is ZRSN50E. He told me on the phone:
-- it is reroutable
-- he didnt see anything about MPM
-- he told me once I'm in Germany (eg SFO>MUC), he doesn't think I could leave Germany again.

My questions:
-- now that you have the exact fare class, can you look up the definite answers to my questions? (i.e. may I leave Germany again eg SFO>MUC>ZRH>STR; may I travel non-LH eg ZRH>VIE)?
-- I asked LH, they cannot email me the exact fare conditions. Where do you have access to these exact terms (so that in the future, I can do it myself)?

Many thanks for your help, it's greatly appreciated.