If you are giving other users access to your database, release an MDE:
Tools | Database Utilities | Make MDE file.
It is not possible to open any form or report in design view, in an MDE, or
to change (or even read) the code in any module.
If these users are sharing the data, presumably you have already split the
database into a back end and front end. The MDE front end distributed to
each user is the normal way to handle this. If splitting is a new idea, see:
Split your MDB file into data and application
at:
http://allenbrowne.com/ser-01.html
