dvd santa will do it but people have had ranging complaints about speed/quality/etc.

some are satisfied with the result, others are not.

if you routinely purchase discs from other countries it may be worth it to purchase a multi-format (ie PAL and NTSC) dvd player and just worry about backing up as normal rather than converting.

if this is a one time thing then dvdsanta will probably be satisfactory.

others may contribute with other programs that have worked for them, but you can play with dvdsanta's free trial while you wait for other responses.

not sure if there are any free programs that will do that conversion.