>I have an SPC inspection program. ISO guys are requiring that I lock the data so that it can't be edited after a certain point.
>
>How can I lock certain records in a table so that they can't be edited.
>
>It's in a database.

first you must to build a write once field ( as a worm disk ),
then you use this like a rw flag into field's check rule, record check rule.

CLEAR
CREATE CURSOR testlock (data I CHECK RW,RW L DEFAULT .T. CHECK CURVAL("RW")) 
APPEND BLANK
REPLACE data  WITH 1
REPLACE RW WITH .T.
&& NOW THE RW FIELD BECOME A STATIC FIELD
REPLACE RW WITH .F.	

* every field with check RW become read only
REPLACE data  WITH 2

* rw can't  return to .T.
REPLACE RW WITH .T.	

? DATA,RW

this is a deceptive solution, and every true ISO guy has to discard it
If you want true read only records then you must write the records into a true worm disk