A procedure with option encrypted that has been loaded from a repository will have its source obfuscated so that it cannot be viewed or debugged.  This is useful when you want to share executable code, but do not want the user to see the source implementation.

The first step in creating an encrypted procedure is to add encrypted to the option sequence of the procedure.

At this point the procedure is not yet encrypted.  It must be saved in a repository first.  Use the savelib command to save the given procedure.  In a subsequent session, if the saved repository has been added to libname, and f is loaded from that repository, then the source code of f can not be viewed.

sq := proc(x) option encrypted; x^2 end proc;

$\mathrm{sq}≔\mathbf{proc}\left(x\right)\mathbf{option}\mathrm{encrypted}\;x\^2\mathbf{end\; proc}$

$\mathrm{eval}\left(\mathrm{sq}\right)$

$\mathbf{proc}\left(x\right)\mathbf{option}\mathrm{encrypted}\;x\^2\mathbf{end\; proc}$

$\mathrm{repo}≔\mathrm{cat}\left(\mathrm{FileTools}:-\mathrm{TemporaryDirectory}\left(\right)\,''/mysq.mla''\right)\:$

$\mathrm{savelib}\left(\mathrm{sq}\,\mathrm{repo}\right)$

$\mathrm{restart}$

$\mathrm{repo}≔\mathrm{cat}\left(\mathrm{FileTools}:-\mathrm{TemporaryDirectory}\left(\right)\,''/mysq.mla''\right)\:$

$\mathrm{libname}≔\mathrm{libname},\mathrm{repo}\:$

$\mathrm{sq}\left(5\right)$

$25$

$\mathrm{showstat}\left(\mathrm{sq}\right)$

Error, (in showstat) cannot debug encrypted procedures