>>Я думаю подобные куски кода можно будет найти и здесь.
> FreeBSD через суд ЗАСТАВИЛИ избавиться от кода UNIX AT&T. Авторы Фряхи заменили
> код UNIX своим.

Всё, что осталось (FreeBSD 13-STABLE):

% grep "AT&T" -r /usr/src | grep Copyright
/usr/src/cddl/contrib/opensolaris/cmd/dtrace/test/cmd/jdtrace/Getopt.java:/* Copyright (c) 1988 AT&T */
/usr/src/cddl/contrib/opensolaris/common/util/strtolctype.h:/*    Copyright (c) 1988 AT&T    */
/usr/src/cddl/contrib/opensolaris/head/nlist.h:/*    Copyright (c) 1988 AT&T    */
/usr/src/cddl/contrib/opensolaris/head/storclass.h:/*    Copyright (c) 1988 AT&T    */
/usr/src/cddl/contrib/opensolaris/head/syms.h:/*    Copyright (c) 1988 AT&T    */
/usr/src/cddl/contrib/opensolaris/lib/libgen/common/gmatch.c:/*    Copyright (c) 1988 AT&T    */
/usr/src/sys/contrib/openzfs/include/sys/mntent.h: *    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T
/usr/src/sys/contrib/openzfs/include/sys/pathname.h:/*    Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/include/sys/uio_impl.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/include/sys/xvattr.h:/*    Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/include/os/linux/spl/sys/errno.h:/*    Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/include/os/freebsd/spl/sys/byteorder.h:/*    Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/include/os/freebsd/spl/sys/processor.h: *    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T
/usr/src/sys/contrib/openzfs/include/os/freebsd/spl/sys/cred.h:/*    Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/include/os/freebsd/spl/sys/vnode_impl.h:/*    Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/include/os/freebsd/spl/sys/sysmacros.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/include/os/freebsd/spl/sys/cmn_err.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/lib/libspl/os/freebsd/getmntany.c:/*    Copyright (c) 1988 AT&T    */
/usr/src/sys/contrib/openzfs/lib/libspl/os/linux/getmntany.c:/*    Copyright (c) 1988 AT&T    */
/usr/src/sys/contrib/openzfs/lib/libspl/mkdirp.c:/*    Copyright (c) 1988 AT&T    */
/usr/src/sys/contrib/openzfs/lib/libspl/include/os/linux/sys/byteorder.h:/*    Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/lib/libspl/include/os/linux/sys/mnttab.h:/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/usr/src/sys/contrib/openzfs/lib/libspl/include/os/freebsd/sys/byteorder.h:/*    Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/lib/libspl/include/os/freebsd/sys/mnttab.h:/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/usr/src/sys/contrib/openzfs/lib/libspl/include/sys/uio.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/lib/libspl/include/sys/vtoc.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/lib/libspl/include/sys/dktp/fdisk.h:/*    Copyright (c) 1984, 1986, 1987, 1988 AT&T    */
/usr/src/sys/contrib/openzfs/lib/libspl/include/rpc/xdr.h: *    Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T
/usr/src/sys/contrib/openzfs/module/zfs/pathname.c:/*    Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/module/icp/include/sys/bitmap.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/module/icp/include/sys/ia32/trap.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989, 1990 AT&T    */
/usr/src/sys/contrib/openzfs/module/os/linux/zfs/zfs_uio.c:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/contrib/openzfs/module/os/freebsd/spl/spl_uio.c:/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/usr/src/sys/cddl/contrib/opensolaris/uts/common/sys/sysmacros.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/cddl/contrib/opensolaris/uts/common/sys/procset.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/cddl/contrib/opensolaris/uts/common/sys/debug.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/cddl/contrib/opensolaris/uts/common/sys/bitmap.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/cddl/contrib/opensolaris/uts/common/sys/cred.h:/*    Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/cddl/contrib/opensolaris/uts/common/sys/cmn_err.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/cddl/contrib/opensolaris/uts/common/sys/processor.h: *    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T
/usr/src/sys/cddl/contrib/opensolaris/common/util/strtolctype.h:/*    Copyright (c) 1988 AT&T    */
/usr/src/sys/cddl/dev/dtrace/riscv/regset.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T        */
/usr/src/sys/cddl/dev/dtrace/arm/regset.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T        */
/usr/src/sys/cddl/dev/dtrace/x86/dis_tables.c:/*    Copyright (c) 1988 AT&T    */
/usr/src/sys/cddl/dev/dtrace/x86/regset.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T        */
/usr/src/sys/cddl/dev/dtrace/x86/instr_size.c:/*    Copyright (c) 1988 AT&T    */
/usr/src/sys/cddl/dev/dtrace/x86/dis_tables.h:/*    Copyright (c) 1988 AT&T    */
/usr/src/sys/cddl/dev/dtrace/powerpc/regset.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T        */
/usr/src/sys/cddl/dev/dtrace/mips/regset.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T        */
/usr/src/sys/cddl/dev/dtrace/aarch64/regset.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T        */
/usr/src/sys/cddl/compat/opensolaris/sys/bitmap.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/cddl/compat/opensolaris/sys/byteorder.h:/*    Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/sys/cddl/compat/opensolaris/sys/mntent.h: *    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T
/usr/src/sys/cddl/compat/opensolaris/kern/opensolaris_uio.c:/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/usr/src/lib/libc/rpc/rpc_xdr.3:.\" Copyright 1989 AT&T
/usr/src/lib/libc/rpc/rpc_svc_err.3:.\" Copyright 1989 AT&T
/usr/src/lib/libc/rpc/rpc_clnt_create.3:.\" Copyright 1989 AT&T
/usr/src/lib/libc/rpc/rpc.5:.\" Copyright 1989 AT&T
/usr/src/lib/libc/rpc/getnetpath.3:.\" Copyright 1989 AT&T
/usr/src/lib/libc/rpc/rpc_svc_reg.3:.\" Copyright 1989 AT&T
/usr/src/lib/libc/rpc/rpc_svc_calls.3:.\" Copyright 1989 AT&T
/usr/src/lib/libc/rpc/rpc_svc_create.3:.\" Copyright 1989 AT&T
/usr/src/lib/libc/rpc/rpc.3:.\" Copyright 1989 AT&T
/usr/src/lib/libc/rpc/getnetconfig.3:.\" Copyright 1989 AT&T
/usr/src/lib/libc/rpc/rpc_clnt_calls.3:.\" Copyright 1989 AT&T
/usr/src/lib/libc/rpc/rpc_clnt_auth.3:.\" Copyright 1989 AT&T
/usr/src/lib/libc/rpc/rpcbind.3:.\" Copyright 1989 AT&T
/usr/src/usr.bin/rpcgen/rpc_scan.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/usr.bin/rpcgen/rpc_parse.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/usr.bin/rpcgen/rpc_util.h:/*    Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T    */
/usr/src/usr.bin/rpcinfo/rpcinfo.8:.\" Copyright 1989 AT&T
/usr/src/contrib/ntp/readme.y2kfixes:      Copyright 1999 AT&T.
/usr/src/usr.sbin/keyserv/keyserv.8:.\" Copyright 1989 AT&T
/usr/src/usr.sbin/rpcbind/rpcbind.8:.\" Copyright 1989 AT&T