SAP ABAP: Hide source code

This is the program to hide ABAP Source code.
report zsap_hide no standard page heading.
************************************************** **********************
This program hides any ABAP's source code and protects it with a
password in this source code.
*
After hiding, you can still run the abap (the load version is intact)
but it cannot be displayed, edited, traced, transported or generated.
*
If the ABAP is not hidden, the program hides it, if it is hidden, it
unhide it.
Remember to hide this program first!
************************************************** **********************
selection-screen begin of block block.
parameters: program(30) obligatory.
selection-screen begin of line.
selection-screen comment 1(8) pwd.
selection-screen position 35.
parameters: password(8) modif id aaa.
selection-screen end of line.
selection-screen end of block block.
*
data: message(60) type c.
*
at selection-screen output.
loop at screen.
if screen-group1 = 'AAA'.
screen-invisible = '1'.
modify screen.
endif.
endloop.
*
initialization.
pwd = 'Password'.
*
start-of-selection.
tables: trdir.

User name and password check
if password 'ABCDEFG'.
write: / 'Wrong password'.
exit.
endif.

SAP owned?
if not program cp 'Z*' and not program cp 'Y*'.
write: / 'Do not hide original SAP programs!'.
exit.
endif.

Exists?
select single * from trdir where name = program.
if sy-subrc 0.
write: / 'Program does not exists!'.
exit.
endif.

Does it have a current generated version?
data: f1 type d, f3 type d.
data: f2 type t, f4 type t.
EXEC SQL.
SELECT UDAT, UTIME, SDAT, STIME INTO :F1, :F2, :F3, :F4 FROM D010LINF
WHERE PROG = :PROGRAM
ENDEXEC.
if f1 < f1 =" f3" new_name =" program." i =" sy-index" j =" 0." j =" j" j =" 1." new_name =" program."> 1.
write: / 'Cannot generate appropriate program name'.
exit.
endif.

Check if it is already hidden
data: f5(30).
EXEC SQL.
SELECT PROG INTO :F5 FROM D010S WHERE PROG = :NEW_NAME
ENDEXEC.
if f5 is initial.

There is no such hidden program, hide it
EXEC SQL.
UPDATE D010S SET PROG = :NEW_NAME WHERE PROG = :PROGRAM
ENDEXEC.
concatenate 'Program' :program 'was hidden.'
into message separated by space.
else.

There is already a hidden program there, unhide it
EXEC SQL.
UPDATE D010S SET PROG = :PROGRAM WHERE PROG = :NEW_NAME
ENDEXEC.
concatenate 'Program' :program 'was restored.'
into message separated by space.
endif.
write message.