Currently this is done mainly for Atari and Amiga computers, and also for some VME based industry standard boards. There is no port of Linux to the old m68k based Macintoshes, because Apple did not supply the needed hardware information. Source code is included for everything in the Debian system. Most of the license terms of programs in the system require that source code be distributed along with the programs, or that an offer to provide the source code accompany the programs. The existence of the program dpkg shows that you should be able to install Debian packages on your system.
Updates are separately available.
The installation prompts the user to specify the keyboard he will use. US laws place restrictions on the export of defense articles, which includes some types of cryptographic software. PGP and ssh fall into this category.