locking a block diagram

[lmd2]

I can lock a block diagram, what I would like to know is the valid character set (upper & lower case, numbers, punctuation?, symbols?) also what  is the maximum length of a password?
thanx in advance
lmd2

[tst]

A quick test shows that you can use a password which is several thousand characters long and has ASCII characters like 0 (NULL), 8 (backspace), 10 (LF) and 13 (CR), so I think that the theoretical limits are probably 2^32 characters (the maximum length of a LabVIEW string [or was it 2^31? ]) and any ASCII character.

Of course, there is usually no reason to do a very long password and you can't input all ASCII characters manually.