EagleFiler supports encryption at the library level. You can have multiple libraries, each of which is either encrypted or not encrypted. An encrypted library works just like a normal library except that all aspects of it (the files, notes, metadata, search indexes, and temporary files) are unreadable until the proper passphrase has been entered.
When creating a New Library…, the Encrypt library using passphrase option lets you store the library on an encrypted disk image. The entire library (including all the files, notes, and indexes) will be stored in a disk image file that is encrypted using AES-128 or AES-256. To access the library, double-click the disk image file and enter the library’s passphrase. The library will appear as a white icon on your desktop, and you can double-click the .eflibrary file to open it in EagleFiler. (You can also access all the files in the library directly from the Finder.) When you’re done with the library, close it in EagleFiler and eject the library from your desktop to lock it again. Now it can only be accessed by people who know the passphrase.
On Mac OS X 10.4, EagleFiler always creates a sparse disk image file using AES-128 encryption. On Mac OS X 10.5, you can choose the format and encryption level of the disk image:
You can quickly access an encrypted library by creating an alias of its .eflibrary file. When you double-click the alias, the Finder will ask for the passphrase and then open the library with EagleFiler.
An encrypted library will only consume the amount of disk space needed to hold its files, indexes, and temporary files. However, you must set a maximum library size that controls how large the library can grow. The larger the maximum size, the more overhead there is for encryption. For example, a library with a 1 GB maximum size will have about 26 MB of overhead, while a library with 500 GB maximum size will have about 111 MB of overhead. If your library reaches the maximum size, you can create a new, larger library and copy all of the files to it by dragging the Records source from the old library to the new one.
To change the passphrase of an encrypted library, eject the library, then open Disk Utility. Drag the library’s disk image file into Disk Utility’s device list, at the left of the window. Select the disk image in the list and choose Images ‣ Change Password.