I've been trying to find a program that could let me password lock or encrypt a CD-R I burned 10 years ago. I do not remember what program I used to burn it. Would it still be possible to modify the disc's empty space to password protect it?

I thought I could try using Bitlocker to lock access to the CD but apparently it doesn't work with optical media. Is there any other method or program that could help?

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There would be little point in doing this. The unencrypted information would still be accessible.

The correct solution might by to copy the disk into a veracrypt container file, then master and burn a new iso including the veracrypt file and optionally a copy of Veracrypt, and then destroy the old disk.

You talk about 10 year time frames - while in practice DVSs are often OK for that period of time, you should not rely on them for that long - if the data is valuable, burn more then 1 copy (using different brands of media) and ideally a different media as well.

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