993 replies to this topic

[t3mp3st]

OMG COME ON PEOPLE REPORT!

Report who? At least one local moderator (myself), and an Administrator (Chronic), already replied to this topic. If anything, staff might get upset about you filing a false report, and calling this project a 'decompiler'. READ.

[Dmaster270]

OMG COME ON PEOPLE REPORT!

Report who? At least one local moderator (myself), and an Administrator (Chronic), already replied to this topic. If anything, staff might get upset about you filing a false report, and calling this project a 'decompiler'. READ.

He's mistaking that changes a GameMaker file for good, for a GameMaker file for bad. He probably messed up his file, and now is made cause he doesn't have his old one anymore. And he can't tell what each variable is.

[bearSoft]

Exelent job Schreib! This is just what i talked about when the pested decompiler was released. I sugested manual Obfuscation of the files before release (biiig job:), but this is neat. Just important to remember the limitation for inside strings.
A list over gm-functions that need to be avoided is needed.
Alone the posibillity to remove all comments is valuable. ...a feature that really ought to be implicite in the gm-build to exe process.. pfuii yyg.. pfyiii.. +booo

[Schreib]

Seriously though, this looks like a pretty good program for protecting you're games from being stolen/edited, too bad it doesn't work on GMK. Does this stuff up resources like sprites, etc. and if so, how does the program recognise them?

It does stuff their names up if you choose that option. The program runs through all code and arguments to find anywhere where those names need to be replaced, so it's not a problem. Otherwise there would be no point with renaming them.

[Zeop]

I just wonder, will this also mess up strings?

Cause it would be quite sad if you made the string"Congrats you beat the game" And it made it into some.. funny text.

[xDanielx]

A list over gm-functions that need to be avoided is needed.
Alone the posibillity to remove all comments is valuable. ...a feature that really ought to be implicite in the gm-build to exe process.. pfuii yyg.. pfyiii.. +booo

Unfortunately the problem doesn't really have a solution. Interpreter-dependent functions -- i.e. variable_global_exists, variable_local_exists, variable_global_get, variable_global_array_get, variable_global_array2_get, variable_local_get, variable_local_array_get, variable_local_array2_get, variable_global_set, variable_global_array_set, variable_global_array2_set, variable_local_set, variable_local_array_set, variable_local_array2_set, execute_string, execute_file, object_event_add, timeline_moment_add, room_set_code -- depend on resource names being known at programming time. Consider this code:

sfx = 'iab' + 'le';
some_val = variable_local_get( 'som' + 'e_' + 'var' + sfx );

There's no plausible way for an obfuscator to avoid breaking code like the above, unless it decides not to obfuscate "some_variable". But if it can't decipher the name of the variable to begin with, it won't know not to obfuscate it.

[Blijbol]

There's no plausible way for an obfuscator to avoid breaking code like the above, unless it decides not to obfuscate "some_variable".

Good idea. Add an input field to the obfuscator in which we can type variable names that we do not want to become obfuscated. Problem solved.

[anonymouss]

I tested this program on a few simple games, and it sure got me. The source code is rendered nearly impossible to read, by anyone other than the amazingly desperate.

As for everyone saying to convert it for GM7- I suggest going over and actually reading the EULA that you are legally bound to.

[Blijbol]

By the way, I'm unable to run this thing. I get the following error:

Java Virtual Machine Launcher
Could not find the main class. Program will exit.

Any suggestions?

[Lukearentz]

This is a good idea, I have thought also about manually changing things which is a large job.
I did consider just using long weird names ect from the start, yet that makes it harder for the programmer.
9.99/10... Cause nothing is perfect

Good Work.

[laigonaz]

Instead of reporting, we should pin this or do something so it won't get forgotten

[Sindarin]

You plan .gmk support, right?

This is a useful tool.

[Somelauw]

You can still use functions like variable_local_set(), but you must be consistent.

if not variable_local_exists("foo")
	 variable_local_set("foo", "bar")

Should work.

[anonymouss]

You plan .gmk support, right?

This is a useful tool.

That would be illegal, if I am correct. Read the EULA.

[Somelauw]

You plan .gmk support, right?

This is a useful tool.

That would be illegal, if I am correct. Read the EULA.

No. The source is your property, so you can do with it whatever you want. The EULA only states that decompiling created games is illegal.

3.3. Neither you nor any third party may modify, adapt, decompile or reverse engineer the Games.

# the Games and all materials accompanying the Games shall include a notice and End User Licence Terms: (i) identifying the rights of YoYo Games and that they include, are based on and made using the Software; (ii) that such end user will have no right to modify, adapt, decompile or reverse engineer the Games or make any use of the Software contained therein nor to permit anyone else to do so; and (iii) that such end user must not remove, disable, modify, add to or tamper with any program code or data, copyright, trademark or other proprietary notices and legends contained within the object (compiled) code of the Software;
# you will not distribute or make avail

Even if the EULA would have said it's illegal, then it would be in conflict with other dominant laws.

[Schreib]

I will have to do some rechecks on whether to add GMK support. I will have a talk with IsmAvatar and YoYoGames about it.

The obfuscator ignores all strings now, simply typing them out as they were. This means that indeed, variable_local_exists, execute_string and the like won't work. But you shouldn't use those functions anyway. The only bigger problem is when people want to use paul32's excellent mapping scripts.

Anyone interested in suggesting more ideas is welcome to PM me.

[Erik Leppen]

By the way, I'm unable to run this thing. I get the following error:

Java Virtual Machine Launcher
Could not find the main class. Program will exit.

Any suggestions?

The exact same error happens here too. Could you (Schreib) provide us a .zip file? This sounds quite useful namely.

Edited by Erik Leppen, 02 May 2008 - 02:10 PM.

[Kyle_Solo]

Java Virtual Machine Launcher
Could not find the main class. Program will exit.

I had that error, but after I installed the latest version of Java it went away.

[laigonaz]

I think you need the latest version of java

[Schreib]

GMC'ers have a tendency to pull away from paragrah V.