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Active3 years, 3 months ago
I installed Visual Studio 2013 Professional as a Trial version while waiting for my company to complete the license purchase.
They completed the purchase of 4 licenses (64 bit), but were not given
Product Keys
. Instead, there is a particular .iso
file with the license or product key embedded in some way.I want to avoid having to uninstall Visual Studio 2013 only to reinstall Visual Studio 2013 and re-setup all my settings. Is this possible? Is there a way to extract the license/product key from the
.iso
or from other coworkers desktops that did a clean install?Here is what I have tried (with 2 coworker installations):
- Looking for the license info in:
HKLMSOFTWAREWow6432NodeMicrosoftVisualStudio12.0Licenses*
but it is unique on both computers. - Looking for the Product Key in:
HKLMSOFTWAREWow6432NodeMicrosoftVisualStudio12.0Registration2000.0x0000PIDKEY
One install had one, which my install said was invalid when attempting to use it. The other install had a blankPIDKEY
. - Looking inside
SW_DVD5_Visual_Studio_Pro_2013_English_MLF_X19-20996.ISO
but I see no mention of a License or Product Key. - Checking their
Help > Register Product
in Visual Studio, which simply saysLicense: Product key applied - Tried doing an install/repair from the ISO but it says:The product version that you are trying to set up is earlier than the version already installed on this computer.Likely because of the Visual Studio 2013 Update 1 and 2
Again, I would really like to avoid the multi-hour process of reinstalling VS 2013. Is there any way?
arserbin3
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1 Answer
I solved this, without having to completely reinstall Visual Studio 2013.
For those who may come across this in the future, the following steps worked for me:
- Run the ISO (or
vs_professional.exe
). - If you get the error below, you need to update the Windows Registry to trick the installer into thinking you still have the base version. If you don't get this error, skip to step 3
- Click the link for 'examine the log file' and look near the bottom of the log, for this line:
- open
regedit.exe
and do anEdit > Find..
for that GUID. In my case it was{6dff50d0-3bc3-4a92-b724-bf6d6a99de4f}
. This was found in:HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftWindowsCurrentVersionUninstall{6dff50d0-3bc3-4a92-b724-bf6d6a99de4f} - Edit the
BundleVersion
value and change it to a lower version. I changed mine from12.0.21005.13
to12.0.21000.13
: - Exit the registry
- Run the ISO (or
vs_professional.exe
) again. If it has a repair button like the image below, you can skip to step 4.- Otherwise you have to let the installer fix the registry. I did this by 'installing' at least one feature, even though I think I already had all features (they were not detected). This took about 20 minutes.
- Run the ISO (or
vs_professional.exe
) again. This time repair should be visible. - Click
Repair
and let it update your installation and apply its embedded license key. This took about 20 minutes.
Hr data manager serial key free. Now when you run Visual Studio 2013, it should indicate that a license key was applied, under
Help > Register Product
:Hope this helps somebody in the future!
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protected by Bhargav Rao♦Jan 10 '16 at 21:40
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Active8 years, 3 months ago
Let's say I have written a program and want to distribute it to people. I want to be able to request a serial number from the user during installation which will validate that they have a licensed copy of the software. Additionally, I want the serial number to store which edition of the software they have access to, and when the license expires.
There are at least two conceptual ways I can think of to accomplish this:
- Generate a serial on the server where user buys software, and email it to them. The software connects to server during installation and activates the product. The server returns the license privileges and expiration. The serial has no specific format/mathematical rules, it is simply checked against the database on the server.
- Generate a serial for the customer and email it to them. The serial has some special mathematical properties which allow the program to check if it is valid, what license it corresponds to, and when it expires.
I'm mostly interested in the 2nd method. What techniques are used in encoding this information in a serial number? If you could give a brief overview that would be great. Otherwise, can you recommend some good books or websites which discuss this?
I find it strange that in all the years I've been coding, I've never actually seen an implementation or description of these techniques.
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2 Answers
What you're thinking about doing is basically creating your own licensing module. Nothing wrong with that, and if you roll your own it's going to be free (just your time to code and debug it). However, it will be enormously simple to crack so if you're doing this to obtain some kind of license compliance (ie copy protection) I wouldn't bother.
Are you going to bind it to the physical machine in some way? One way is to get the CPU serial number, HD serial number, MAC address, etc, or some combination of the above, hash them and use the hash to check at startup to make sure the license is valid. Of course, if the user changes anything the check will fail and they might be irritated that their software will no longer run, even though they have a valid license.
If you're doing this for protection against illegal copying or usage, the schema you're proposing is usually pretty simple to crack--a cracker looks for where you check for the right license and just patches the asm code to branch around it or always return a positive. If your app is .NET they can just reverse to source code and remove the license checking part.
Disclaimer: I work for a license management/copy protection tools company ([Wibu-Systems])1 and this is all we do, so we know how easy it is to defeat most systems.
I'd recommend one of three methods:
- Leave your app unprotected and hope your sales to pirated copies ratio is reasonable.
- Roll a simple system but recognize that if the s/w has value someone will crack it quickly and easily. Be prepared for some complex coding and maintenance to do this even half decently.
- Buy a commercial-quality protection system like CodeMeter, HASP, or KeyLok. Some are better than others (we think ours is the best, naturally), but none is free.
John BrowneJohn Browne
Okay, so two weeks without an answer.I'm going to answer with a very simple method I've come up with for generating relatively secure, and highly scalable serial numbers using elementary methods.
As a mathematician, I'm quite positive that there are some advanced techniques for storing all sorts of information in a serial number - but I'm mainly interested in quick-and-dirties. Wonderfox hd video converter factory pro 9.6 serial key.
Here's a naive, non-mathematical, brute-force technique to consider:
Create a
byte[]
array containing the characters you want to use. You can use hex only, but there's no reason to limit yourself. Why not use the whole alphanumeric range minus '0'/'O', and '1'/'I' (for obvious reasons).Next, write a function as follows (example is C#):
This will give you a random serial number, which we don't know is valid or not.
Next:
and then
What we have now is a way of summing together the 16-byte output of the MD5 hashing function, and evaluating whether the sum modulo n is equal to some x.
Now, decide on how many serial numbers you want to exist. The more serial numbers exist, the easier it is that someone will randomly guess a valid combination.
Split your random serial into blocks. Let's say 5 blocks of 4, giving 20 characters in the form: ABCD-EFGH-IJKL-MNOP-QRST
Create 5 arrays out of your serial number:
{A, B, C, D}, {E, F, G, H}, {I, J, K, L}, {M, N, O, P}, and {Q, R, S, T}.
test to see if your 5 arrays validate as follows:
If you set radix to 2, then there is a 1/2 probability that the block will be valid. If you set the radix to 10, then there is a 1/10 probability that the block will be valid. If you have 5 blocks, and you set the radices each to 10, then the probability that the whole serial number will be valid is 0.1^5 = 0.00001. (In other words, 1 in every 100000 random serials will be valid. That means if you use the full alphanumeric range minus '0'/'O', '1'/'I' then you have (8 + 24)^n * 0.00001 = ~1.2 * 10^19 valid keys for a serial length of 20. That's a lot - but remember you're not going to find them all anyway. The higher your radix, the more secure the serial will be, but the longer it will take to generate).
Note, 'expected' should be somewhere between 0 and radix-1.
So now we have a way of validating a particular serial number as valid, but how do we store what type of serial it is? As a matter of fact, we already have the method to do it. Taking the entire random (but validated) serial 'sn':
The number of each type of license will gradually level out as you generate more and more keys.
If you want to store additional information in the key, for example expiry dates, you can use similar methods. You could, for example take the sum of the odd characters modulo 12 to get an expiring month, and the modulo 31 of the sum of the even characters to give the expiring day.
The more of these restrictions and sub-divisions you apply, the longer it will take to generate each type of key.
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