See README file. (It also says "Some plugins are GPL3." but I cannot find any file marked such.)
As discussed with Tommy[D] on IRC: freenet.jar is the project code and seems to contain only things from the src/{freenet,net} subdirectories. Licenses found therein are: - GPL-2+, main license - GPL-2 (only), some files in src/freenet/crypt/ and src/freenet/support/ - MIT (X11) for code taken from bouncycastle - BSD-2 (identical to "Cryptix license") for Cryptix code - src/net/i2p/util/NativeBigInteger.java was "released into the public domain" In addition, the ebuild installs a precompiled ant.jar; Apache-2.0 is needed for this.
*freenet-0.7.5_p1423 (20 Dec 2012) 20 Dec 2012; Thomas Sachau (Tommy[D]) <tommy@gentoo.org> -freenet-0.7.5_p1419.ebuild, -freenet-0.7.5_p1421.ebuild, -freenet-0.7.5_p1422.ebuild, +freenet-0.7.5_p1423.ebuild: Version bump, drop old, fix license, fixes bug 446618 with thanks to ulm