From: GP <[EMAIL PROTECTED]> Dari http://www.pcmech.com/article.htm?copyprot Nah, sekarang dari masing-masing sistem CD protection ini, apa software burner yang bisa ngakalin supaya bisa dicopy seperti originalnya? -=-=-=-=-=-=-=-=-=- Copy Protection - It Came from Silicon Valley By Jeffrey Powell So, you just got this cool new computer game / program / software. You pop in the CD, and watch as the amazing lights, flashy animations, and widgets fly across your screen in a dazzling display of sheer computer industry egoism introduces�the installer. It is at this moment that your neighbor, Phil, accidentally pounds a hole in the apartment wall separating the two of you. Seeing the amazing installer, he vows on the bloody thumb he now has that he must get that software. He looks at your also newly purchased CD burner. In the interest of safety from others like Phil who would pound down your walls, and possibly damage your CD, you decide that it would be a good idea to�make a backup copy. Phil goes home, but before he even lets the awe-inspiring installer start up, he decides that redundancy is the best way to go. So what does he do, he makes another backup copy, and gives it to his friend Grzny (born of vowel deprived Serbian parents). They put in the CDs in their respective computers, watch the amazing installer, and then they watch as an utterly unflattering box pops onto the screen informing them of something to the effect that a function call was not properly addressed. Or, perhaps, the installer did not even run. This could only mean one thing: you, Phil, and Grzny all have an ::insert ominous tone:: uncopyable CD. A CD with a copy protection mechanism on it, that is. The topic of this article is just that - copy protection on CDs. --Please note: The story outlined above dealt with copyright violation in a manner congruent with that of many consumers nowadays. It is not the views of the PCMedia Network that a single, legal backup of a software title be distributed, nor is it the views of the author that such should be done. It is, in fact, illegal. Neither does this article deal with the circumnavigation of said copy protection, solely with the copy protection methods themselves. - There, now that I have properly disclaimed my entire article, I can begin. There are a number of methods currently in use to protect CDs. They range from the basic to the nifty to the downright bulky and burdensome. The basic methods, which really aren't as much of an overt protection as they are a hindrance, include dummy files, illegal TOCs, and over-burning. Dummy files are those files on some CDs which appear to be excessively large, often in excess of 600 MB. This puts the average CD size well over 1 GB, and the average CD-Writer just will not burn an image that is that size onto a 74-minute CD-R. An Illegal TOC is one that is not permitted by ISO standards. An example of such would be one that has improper track layout, such as a secondary data track following some audio tracks. Over-burning would be putting greater than 74- minutes of data on a CD. The average person does not purchase 80-minute CD-R's, and as such doing thus keeps the company relatively certain that their data is safe. Seldom used, though it has been used, is the practice of physically damaging discs. For example, the absence of data for a part of the CD. This protection is unquestionably effective, as CD-Writers tend to frown on creating an image of a CD like that, let alone burning a CD with a "hole" in the middle of the data track. The current methods used by companies who want "that added touch" of security have real names. Not names in use by hackers / crackers / etc., but actual product names - copyrighted, trademarked, and all. Examples are Safedisc, SecuROM, and LaserLock. LockBlocks also comes to mind (but information is sketchy regarding them, as they have put no information about their copy protection method on their site (which happens to be in Spanish, with no English mirror)). SafeDisc is a nice, widely used protection method. It involves a digital signature on the disc, along with function calls in the program to check the signature. Hence, the original disc must be used, otherwise the program will not run. There are a very large quantity of bad sectors on SafeDisc protected discs. These bad sectors comprise the "digital signature" of which they speak, as such would make it nearly uncopyable by CD-Writers, which tend to ignore bad sectors. It also encrypts the actual executable, and, when said executable is decrypted, it is only sent to RAM, never stored locally. SecuROM, another relatively widely used protection method, differs in that it does not rely on deliberately introduced unreadable errors to the disc (like Safedisc does). As best I can guess (no one gives out their secrets anymore), the "electronic fingerprint", which SecuROM relies upon for security, is stored in the sub-channel of the data track of the CD. Though this is not necessarily true, it is a possibility. LaserLock is recognizable by a hidden directory containing files with unreadable errors. The system itself is comprised of both a software portion, which encrypts some data, a physical signature on the disc, and the hidden data. The software checks the size and position of the signature, as well as the hidden data, before decrypting the program. Other CD copy protection methods exist, but most of them fit with what is outlined above. Either unreadable errors, encryption of the primary executable along some unique guidelines, or a combination of the two is generally used. However, one thing I see stands out The Bongle. Nope, not a dongle, kind of. It is a dongle, but its not a dongle. In the traditional sense, a dongle is attached externally to a serial or parallel port, or whatnot. In this case, the Bongle is put into the CD-ROM drive. As far as I can tell, the Bongle is used for applications run off of a network. Authorized users are given Bongles, which they will put in the CD-ROM drive of the workstation they are using. The Bongle itself is likely protected by a method outlined above. Generally, all of these protective measures work on the concept that consumers do not have the capacity to read raw data from a CD, as reading raw data would keep all bad sectors, all data, everything but the physically printed information. I would like to note that because none of the companies who manufacture any of these forms of CD copy protection give specifics on how their protection works (for good reason), I cannot guarantee that all of my statements are 100% accurate. For the most part, I am certain about the information given, however I will not be held liable if one of you goes on a game show and loses with my information. As for the manufacturers of the copy protective methods - Macrovision produces SafeDisc, MLS Laserlock International produces LaserLock, and SecuROM is produced by Sony. -- Garind P =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= "oc ur mobo not urself or anybody else" -- Compu-Mania MailingList, provided by PT Centrin Utama Unsubscribe: [EMAIL PROTECTED], body: unsubscribe Compu-Mania Archive: http://www.mail-archive.com/[email protected]/ Info: [EMAIL PROTECTED], body: help
