guys i have come across a cd which has a feature i never came across before.... not even heard of it. Its the Billing System Software cd which our org is using and the unique thing about it is only one time installation. well i heard of all kind of copy protections and restrictions imposed by the software devlopers on the cd to avoid making the copies of it but this kind of protection is something which i never thought before.
Question:
can someone throw light on it how it is achieved and is it possible for us to make a similar kind of cd.
My biggest doubt is that how does the optical disk know that i have been used for installation once and my life is over.The cd when opened thereafter,the contents are accessible but the installer cannot be opened.
The cd is not Copy protected , i checked it using clone xl and clone cd.
However i made an image using the clone cd but the behavior of the both the cds were same.
On inserting the cd one can explore the cd and view the files but when click on installer it won't execute.
The installer exe has become like a ms-dos file and nothing happens on clicking. So i think the changes take place in the installer itself.
suppose .. i'm using a CD-ROM, not a CD R/W.. how could it be possible that the installer file has been changed directly? If you use a R/W, then we can say that, they made the installer file such a way, when it got installed it will be re-writted by the hidden commands [we can burn a cd directly using XP].
Answer:
yes. these type of copy protected cds exists
actually the die layer of the cd-r has a point at a distance say where the end file of installer is stored..
which breaks as soon it is read..
and the cd is unusable
confusing???????????????
LET ME CLARIFY
See guys !!!!!!!!! have you work on microsoft office 97
i have original cd of microsoft windows 97...........
the property of this cd was its installer or setup runs only once in any computer .. after that the matter was left on cd
but cd refuses to run installer
but you can view files..
also if you have install minimal or custom install then you can make full install later on or install component of your choice
but the full installer wud not work again
if you take it to other pc or format your harddrive then also it will not work
if you copy the contents to other cd then that cd will also behave in same manner and will give you error"installer will not run"
if you copy the contents to your harddisk & then run setup then also you will get the same error & installer will not work..
so this was the sceneario
ACTUALLY this was done by a combination of copy-protection techniques at both hardware level as well as software level......
THE HARDWARE LEVEL PROTECTION
guys did u hear of rental cds and dvds whose life are only 3 days after being opened
these were movie cds which were given on rent and u have not to visit shop again to return them . also there is no jhanjhat of depositing security
just take it on rent , watch it & throw it in dustbin or use as item in showcase
so here the same story
there is a small invisible block in cd which is made of special dye which is different from the dye which is on rest of cd..
the property of this special dye is that whenever a laser beam falls on it
it get melt and the data stored in particular block is lost
the data in the block is generally the end point of installer
so when you install a software from such cd
then when you come to the end of installer
the laser beam from cd-rom falls on that block
and the disc knows that she has been used before
there is no registry
as if there was registry involved then why disc does not run on other or newly freshed pc
no matter is written on disc
because we use it in cd-rom
AT SOFTWARE LEVEL
at software level installer checks that the software is already installed or not. if it is already installed with the same key then you can use the cd for custom install & update..
if software is not already installed(checks in registry) then it starts the installer . which verifies some condition
which is true if SPECIAL BLOCK(disscussed above)==intact
then installer will run
is false if SPECIAL BLOCK==ruined
then installer will produce "error message"
and abort the installation.
if we make copy of cd then that wud also behave in same manner
because when we copy disc then all the contents are copied as it is
if the SPECIAL BLOCK has already ruined or destroyed
then it will be copied in destroyed form on harddisk or on copied cd
that's why u will not be able to run the setup from there
Que..
if we copy a fresh disc whose SPECIAL BLOCK has not been destroyed
then the copied cd will work perfectly or not?
I am not sure. i have not tried it .
YES , acc. to logic they should work in normal way & bypassing the copy-protection
may pirates have work same way to produce pirated cds of office97
few years back
and this may be the reason of failure of such copy-protection technique
this technique was also discouraged due to liscensing problems
when you purchase a software you purchase rights to install it in one particular comp..for lifetime
if you change operating system or do a fresh install then you have no option other than to go & buy another copy of software
also in case if you purchase new comp.
or upgrade ur pc major components like mobo , processor
then u have to install os again.......
such copy-protected cd will then put you in fix
i hope your querries have been cleared
if you have doubts then post here
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